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 | 0 |
| 2 | 2772 |
| 3 | 42624 |
| 4 | 335052 |
| 5 | 1545984 |
| 6 | 5698860 |
| 7 | 16297344 |
| 8 | 42785244 |
| 9 | 94440960 |
| 10 | 204094296 |
| 11 | 385391232 |
| 12 | 730053060 |
| 13 | 1240934400 |
| 14 | 2151268128 |
| 15 | 3374469504 |
| 16 | 5476016700 |
| 17 | 8115545088 |
| 18 | 12477938100 |
| 19 | 17677480320 |
| 20 | 26111897640 |
| 21 | 35570481408 |
| 22 | 50909418000 |
| 23 | 67336722432 |
| 24 | 93433877268 |