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 | 6 |
| 2 | 72 |
| 3 | 900 |
| 4 | 11520 |
| 5 | 149904 |
| 6 | 1976400 |
| 7 | 26363232 |
| 8 | 355648320 |
| 9 | 4854292416 |
| 10 | 67114780416 |
| 11 | 941774874624 |
| 12 | 13451571452160 |
| 13 | 196362144456192 |
| 14 | 2945496714485760 |
| 15 | 45717104468689920 |
| 16 | 740282299231703040 |