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 | 12 |
| 4 | 192 |
| 5 | 24 |
| 6 | 8160 |
| 7 | 2400 |
| 8 | 898560 |
| 9 | 384480 |
| 10 | 14400 |
| 11 | 245145600 |
| 12 | 126040320 |
| 13 | 9777600 |
| 14 | 50400 |
| 15 | 159035627520 |
| 16 | 90043269120 |
| 17 | 9660672000 |
| 18 | 179222400 |
| 19 | 80640 |
| 20 | 237882053283840 |
| 21 | 141969202744320 |
| 22 | 17961178152960 |
| 23 | 547498828800 |
| 24 | 2586608640 |
| 25 | 802369403419852800 |