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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 80 |
| 8 | 3150 |
| 9 | 36736 |
| 10 | 359520 |
| 11 | 3532800 |
| 12 | 36115200 |
| 13 | 383708160 |
| 14 | 4247443200 |
| 15 | 48673996800 |
| 16 | 515675160000 |
| 17 | 5654852403200 |
| 18 | 64785924403200 |
| 19 | 788119068672000 |
| 20 | 9695238119424000 |
| 21 | 125961866477568000 |
| 22 | 1700829800017920000 |
| 23 | 24580421999198208000 |