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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 691 |
| 11 | 43688 |
| 12 | 1553322 |
| 13 | 41048184 |
| 14 | 900113808 |
| 15 | 17353890816 |
| 16 | 304617949952 |
| 17 | 4981087243264 |
| 18 | 77092396405248 |
| 19 | 1142386254729216 |
| 20 | 16347546554540544 |
| 21 | 227391442095863808 |
| 22 | 3090231533090021376 |
| 23 | 41195837323058675712 |
| 24 | 540459023153920671744 |