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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 25 |
| 6 | 88 |
| 7 | 366 |
| 8 | 1583 |
| 9 | 7336 |
| 10 | 34982 |
| 11 | 172384 |
| 12 | 867638 |
| 13 | 4452029 |
| 14 | 23194392 |
| 15 | 122462546 |
| 16 | 653957197 |
| 17 | 3527218134 |
| 18 | 19192275883 |
| 19 | 105248481503 |
| 20 | 581223149532 |
| 21 | 3230039198628 |
| 22 | 18053111982952 |
| 23 | 101426901301489 |
| 24 | 572554846192811 |
| 25 | 3246191706162233 |
| 26 | 18478844801342495 |