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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 12 |
| 7 | 12 |
| 8 | 3 |
| 9 | 9 |
| 10 | 720 |
| 11 | 720 |
| 12 | 160 |
| 13 | 160 |
| 14 | 35 |
| 15 | 189 |
| 16 | 189 |
| 17 | 189 |
| 18 | 145152 |
| 19 | 145152 |
| 20 | 7257600 |
| 21 | 12800 |
| 22 | 275 |
| 23 | 275 |
| 24 | 136857600 |
| 25 | 684288000 |
| 26 | 4343625 |
| 27 | 17875 |
| 28 | 875875 |
| 29 | 875875 |
| 30 | 125536739328 |
| 31 | 125536739328 |
| 32 | 15324309 |
| 33 | 637 |
| 34 | 709689344 |
| 35 | 9052160000 |
| 36 | 18104320000 |
| 37 | 18104320000 |
| 38 | 2624375 |