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 | 5 |
| 3 | 32 |
| 4 | 258 |
| 5 | 2518 |
| 6 | 28733 |
| 7 | 374188 |
| 8 | 5465748 |
| 9 | 88364877 |
| 10 | 1564525351 |
| 11 | 30076618014 |
| 12 | 623362069525 |
| 13 | 13846300701886 |
| 14 | 327952448024833 |
| 15 | 8246654495001815 |
| 16 | 219323630123687561 |
| 17 | 6148716950721967215 |
| 18 | 181171993247893669702 |
| 19 | 5595764936875993028696 |
| 20 | 180742802515427561158060 |
| 21 | 6092097271225726649472555 |