Nonprofit · EIN 30-0562250
THE OEIS FOUNDATION INC
Tax-exempt · EWING, NJ 08628
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $111,681 | $145,188 | -$33,507 | $3,479,140 | $0 | $3,479,140 |
| December 31, 2024 | 990 | $2,471,047 | $22,920 | $2,448,127 | $3,124,122 | $0 | $3,124,122 |
| December 31, 2023 | 990-EZ | $40,030 | $24,985 | $15,045 | $464,312 | $0 | $464,312 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $52,196
- Program service revenue
- $0
- Investment income
- $59,485
- Other revenue
- $0
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $81,053
- Salaries, compensation and benefits (total)
- $81,689
- Professional fundraising fees
- $0
- Legal fees
- $37,453
- Program services (functional)
- $143,158
- Management and general (functional)
- $2,030
Balance sheet and other
- Total assets, start of year
- $3,124,122
- Total assets, end of year
- $3,479,140
- Total liabilities, end of year
- $0
- Net assets, end of year
- $3,479,140
- Publicly traded securities
- $3,425,468
- Gross receipts
- $111,681
- Employees
- 1
- Volunteers
- 35
- Year formed
- 2009
- State of legal domicile
- NJ
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| Sean Irvine | Trustee Trustee or director | 40 | $0 | $72,733 |
| David L Applegate | Trustee Trustee or director | 2 | $0 | $0 |
| Joerg Arndt | Trustee Trustee or director | 4 | $0 | $0 |
| Ray Chandler | Trustee Trustee or director | 2 | $0 | $0 |
| Harvey P Dale | Trustee Trustee or director | 4 | $0 | $0 |
| Tom Duff | Trustee Trustee or director | 2 | $0 | $0 |
| Charles R Greathouse | Trustee Trustee or director | 2 | $0 | $0 |
| Simon Plouffe | Trustee Trustee or director | 2 | $0 | $0 |
| Lara K Pudwell | Trustee Trustee or director | 2 | $0 | $0 |
| Bridget Tenner Ragnarsson | Trustee Trustee or director | 2 | $0 | $0 |
| N J A Sloane | Chairman Officer | 16 | $0 | $0 |
| Russell S Cox | President Officer | 20 | $0 | $0 |
| Marc LeBrun | Vice President Officer | 3 | $0 | $0 |
| Alexandar D Healy | Secretary Officer | 3 | $0 | $0 |
| Robert R Price | Treasurer Officer | 16 | $0 | $0 |
990 for the year ended December 31, 2024: 15 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Michael De Vlieger | Employee Key employee | 4 | $8,320 |
| N J A Sloane | Chairman Trustee or director | 20 | $0 |
| Russell S Cox | President Trustee or director | 20 | $0 |
| David L Applegate | Trustee Trustee or director | 0 | $0 |
| Alexandar D Healy | Secretary Trustee or director | 3 | $0 |
| Robert R Price | Treasurer Trustee or director | 5 | $0 |
| Joerg Arndt | Trustee Trustee or director | 0 | $0 |
| Ray Chandler | Trustee Trustee or director | 0 | $0 |
| Harvey P Dale | Trustee Trustee or director | 5 | $0 |
| Tom Duff | Trustee Trustee or director | 0 | $0 |
| Charles R Greathouse | Trustee Trustee or director | 0 | $0 |
| Marc LeBrun | Vice President Trustee or director | 0 | $0 |
| Simon Plouffe | Trustee Trustee or director | 0 | $0 |
| Lara K Pudwell | Trustee Trustee or director | 0 | $0 |
| Bridget E Tenner | Trustee Trustee or director | 0 | $0 |
990-EZ for the year ended December 31, 2023: 15 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| Michael De Vlieger | Employee | 4 | $160 | $12 |
| N J A Sloane | Chairman | 20 | $0 | $0 |
| Russell S Cox | President | 20 | $0 | $0 |
| David L Applegate | Trustee | 0 | $0 | $0 |
| Alexandar D Healy | Secretary | 2 | $0 | $0 |
| Robert R Price | Treasurer | 10 | $0 | $0 |
| Joerg Arndt | Trustee | 0 | $0 | $0 |
| Ray Chandler | Trustee | 0 | $0 | $0 |
| Harvey P Dale | Trustee | 3 | $0 | $0 |
| Tom Duff | Trustee | 0 | $0 | $0 |
| Charles R Greathouse | Trustee | 0 | $0 | $0 |
| Marc LeBrun | Vice President | 2 | $0 | $0 |
| Simon Plouffe | Trustee | 0 | $0 | $0 |
| Lara K Pudwell | Trustee | 0 | $0 | $0 |
| Bridget E Tenner | Trustee | 0 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 820 BEAR TAVERN RD, EWING, NJ 08628-1021
- In care of
- % NEIL SLOANE
- Mailing address (990-N for 2016)
- 11 South Adelaide Ave, HIGHLAND PARK NJ 08904
- Principal officer (990 for 2025)
- N J A Sloane, 11 South Adelaide Avenue, Highland Park, NJ 08904
- Principal officer (990-N for 2016)
- N J A SLOANE, 11 South Adelaide Ave, HIGHLAND PARK NJ 08904
- Signed the 990
- Robert Price, Treasurer
- Phone
- (412) 738-3782
- Website
- oeisf.org
Mission
Maintain the OEIS website (oeis.org), used by scientists world-wide.
Program accomplishments
- Maintain OEIS website (oeis.org), used by scientists world-wide.Expenses $131,436
- Reach out to scientists world-wide to introduce them to the OEIS.Expenses $11,722
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990-EZ on file |
IRS record
- EIN
- 30-0562250
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 2009
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Arts, culture and humanities (A30)
- Assets (IRS master file)
- $3,479,140
- Income (IRS master file)
- $111,681
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $111,681 | $145,188 | $3,479,140 | XML |
| 990 | December 2024 | $2,471,047 | $22,920 | $3,124,122 | XML |
| 990-EZ | December 2023 | $40,030 | $24,985 | $464,312 | XML |
| 990-EZ | December 2022 | – | – | – | IRS |
| 990-EZ | December 2021 | – | – | – | IRS |
| 990-N for 2016 Officer: N J A SLOANE | December 31, 2016 | ≤ $50,000 receipts | – | – | e-Postcard |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 30-0562250).
Questions about THE OEIS FOUNDATION INC
- What is the EIN of THE OEIS FOUNDATION INC?
- The employer identification number (EIN) of THE OEIS FOUNDATION INC is 30-0562250.
- Is THE OEIS FOUNDATION INC tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2009.
- Are donations to THE OEIS FOUNDATION INC tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does THE OEIS FOUNDATION INC file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of THE OEIS FOUNDATION INC due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did THE OEIS FOUNDATION INC last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of THE OEIS FOUNDATION INC?
- The 990 for the year ended December 31, 2025 names N J A Sloane.
- Who are the officers and directors of THE OEIS FOUNDATION INC?
- The 990 for the year ended December 31, 2025 lists 15 people; 0 received compensation from the organization.
- How much revenue does THE OEIS FOUNDATION INC have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $111,681, expenses of $145,188 and total assets of $3,479,140 at year end.
Other nonprofits in EWING
- PHILADELPHIA PATHWORK REGION INC EIN 23-3014385 · last filed 990-N for 2024
- BODY LANGUAGE DANCE CENTER PARENT FUNDRAISING GROUP EIN 39-3127795 · last filed 990-N for 2024
- BODY LANGUAGE DANCE CENTER PARENT ASSOCIATION EIN 84-3212441 · last filed 990-N for 2024
- GREATER TRENTON CHORAL SOCIETY INC EIN 22-2488785 · last filed 990-N for 2023
- SONS AND DAUGHTERS OF ERIN EIN 46-3643733 · last filed 990-N for 2025
- CASA CULTURA EIN 61-2267309 · last filed 990-N for 2025
- CAPT GERSHOM MOTTS 6TH CO 2ND CONTINENTAL ARTILLERY REGIMENT INC EIN 22-3213761 · last filed 990-N for 2025
- GREATER TRENTON PIPES AND DRUMS INC EIN 20-0150869 · last filed 990-N for 2023
All nonprofits in EWING · New Jersey · Arts, culture and humanities