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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 36 |
| 5 | 360 |
| 6 | 6120 |
| 7 | 171360 |
| 8 | 7882560 |
| 9 | 591192000 |
| 10 | 72125424000 |
| 11 | 14280833952000 |
| 12 | 4584147698592000 |
| 13 | 2383756803267840000 |
| 14 | 2007123228351521280000 |
| 15 | 2735708960243123504640000 |
| 16 | 6034973966296330451235840000 |
| 17 | 21544857059677899710911948800000 |