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 | 0 |
| 2 | 5 |
| 3 | 9 |
| 4 | 222 |
| 5 | 1140 |
| 6 | 13903 |
| 7 | 99051 |
| 8 | 972080 |
| 9 | 7826275 |
| 10 | 71053230 |
| 11 | 599141127 |
| 12 | 5285091303 |
| 13 | 45349095730 |
| 14 | 395755191515 |
| 15 | 3418116104881 |
| 16 | 29709767180643 |
| 17 | 257232791130155 |
| 18 | 2232466696767889 |
| 19 | 19346930092499853 |
| 20 | 167813061128260612 |
| 21 | 1454798219804865516 |
| 22 | 12616086588695738786 |