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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1350 |
| 7 | 529200 |
| 8 | 172872000 |
| 9 | 58352555520 |
| 10 | 21677788944000 |
| 11 | 9059008787136000 |
| 12 | 4286753834515891200 |
| 13 | 2297335836334687948800 |
| 14 | 1390520517156693315993600 |
| 15 | 946759961227258909995264000 |