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 | 8 |
| 5 | 40 |
| 6 | 96 |
| 7 | 168 |
| 8 | 384 |
| 9 | 1728 |
| 10 | 15360 |
| 11 | 50688 |
| 12 | 221184 |
| 13 | 299520 |
| 14 | 1290240 |
| 15 | 3628800 |
| 16 | 30965760 |
| 17 | 65802240 |
| 18 | 743178240 |
| 19 | 7060193280 |
| 20 | 237817036800 |
| 21 | 624269721600 |
| 22 | 5231974809600 |
| 23 | 28716407193600 |
| 24 | 479439146188800 |