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 | 8 |
| 3 | 144 |
| 4 | 5760 |
| 5 | 403200 |
| 6 | 43545600 |
| 7 | 6706022400 |
| 8 | 1394852659200 |
| 9 | 376610217984000 |
| 10 | 128047474114560000 |
| 11 | 53523844179886080000 |
| 12 | 26976017466662584320000 |
| 13 | 16131658445064225423360000 |
| 14 | 11292160911544957796352000000 |
| 15 | 9146650338351415815045120000000 |