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 | 6 |
| 3 | 96 |
| 4 | 2330 |
| 5 | 76230 |
| 6 | 3132192 |
| 7 | 154830704 |
| 8 | 8942749020 |
| 9 | 590880389676 |
| 10 | 43950871549640 |
| 11 | 3634094909879808 |
| 12 | 330648849617038680 |
| 13 | 32827596801363717080 |
| 14 | 3531510395923598074560 |
| 15 | 409199784951469138012800 |
| 16 | 50807611780916913209679632 |
| 17 | 6729703201077108496483268880 |