This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 31 |
| 4 | 247 |
| 5 | 529 |
| 6 | 559 |
| 7 | 1747 |
| 8 | 181 |
| 9 | 4651 |
| 10 | 147331 |
| 11 | 1276726 |
| 12 | 10379813 |
| 13 | 10527373 |
| 14 | 501426731 |
| 15 | 507546131 |
| 16 | 14874882499 |
| 17 | 120130384067 |
| 18 | 8121140473289 |
| 19 | 597694372183697 |
| 20 | 7829048769596861 |
| 21 | 7886595152525441 |
| 22 | 341425446875737163 |
| 23 | 26430832817384951 |
| 24 | 2579018441538210647 |
| 25 | 137426518826740878691 |