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 | 5 |
| 4 | 7 |
| 5 | 7 |
| 6 | 11 |
| 7 | 143 |
| 8 | 143 |
| 9 | 2431 |
| 10 | 4199 |
| 11 | 4199 |
| 12 | 7429 |
| 13 | 7429 |
| 14 | 7429 |
| 15 | 215441 |
| 16 | 392863 |
| 17 | 392863 |
| 18 | 20677 |
| 19 | 765049 |
| 20 | 765049 |
| 21 | 31367009 |
| 22 | 58642669 |
| 23 | 58642669 |
| 24 | 2756205443 |
| 25 | 2756205443 |
| 26 | 2756205443 |
| 27 | 146078888479 |
| 28 | 5037203051 |
| 29 | 5037203051 |
| 30 | 9586934839 |