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 | 8 |
| 3 | 63 |
| 4 | 656 |
| 5 | 8525 |
| 6 | 133120 |
| 7 | 2430547 |
| 8 | 50839808 |
| 9 | 1199150649 |
| 10 | 31495553024 |
| 11 | 911770726823 |
| 12 | 28846956187648 |
| 13 | 990358890251653 |
| 14 | 36670756251238400 |
| 15 | 1456804472261953275 |
| 16 | 61808742217201811456 |
| 17 | 2789456491560247772657 |