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 | 1 |
| 2 | 144 |
| 3 | 12960 |
| 4 | 207360 |
| 5 | 2612736 |
| 6 | 9405849600 |
| 7 | 18811699200 |
| 8 | 1083553873920 |
| 9 | 4022693756928000 |
| 10 | 300361133850624000 |
| 11 | 210853515963138048000 |
| 12 | 151814531493459394560000 |
| 13 | 151814531493459394560000 |
| 14 | 21861292535058152816640000 |