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 | 12 |
| 3 | 8 |
| 4 | 240 |
| 5 | 96 |
| 6 | 4032 |
| 7 | 1152 |
| 8 | 34560 |
| 9 | 7680 |
| 10 | 101376 |
| 11 | 18432 |
| 12 | 50319360 |
| 13 | 7741440 |
| 14 | 6635520 |
| 15 | 884736 |
| 16 | 451215360 |
| 17 | 53084160 |
| 18 | 42361159680 |
| 19 | 4459069440 |
| 20 | 1471492915200 |
| 21 | 140142182400 |
| 22 | 1758147379200 |
| 23 | 152882380800 |
| 24 | 417368899584000 |
| 25 | 33389511966720 |
| 26 | 15410543984640 |