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 | 2 |
| 2 | 24 |
| 3 | 600 |
| 4 | 23520 |
| 5 | 1270080 |
| 6 | 87816960 |
| 7 | 7420533120 |
| 8 | 742053312000 |
| 9 | 85781362867200 |
| 10 | 11260753452748800 |
| 11 | 1655330757554073600 |
| 12 | 269436914075724595200 |
| 13 | 48113734656379392000000 |