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 | 8 |
| 2 | 72 |
| 3 | 880 |
| 4 | 16032 |
| 5 | 461992 |
| 6 | 21944520 |
| 7 | 1770483408 |
| 8 | 248136807776 |
| 9 | 61460157645704 |
| 10 | 27267123945408968 |
| 11 | 21902527945097597616 |
| 12 | 32134030755805852610720 |
| 13 | 86739696410985770930422760 |