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 | 46 |
| 6 | 4431 |
| 7 | 73098 |
| 8 | 587149 |
| 9 | 3125278 |
| 10 | 12712329 |
| 11 | 42731866 |
| 12 | 124522115 |
| 13 | 324628878 |
| 14 | 773900299 |
| 15 | 1714106922 |
| 16 | 3569586561 |
| 17 | 7053577342 |
| 18 | 13321444117 |
| 19 | 24185953530 |
| 20 | 42413141575 |
| 21 | 72121174766 |
| 22 | 119308962279 |
| 23 | 192546161866 |
| 24 | 303861667221 |
| 25 | 469873699038 |
| 26 | 713211276481 |