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 | 252 |
| 1 | 2772 |
| 2 | 16632 |
| 3 | 72072 |
| 4 | 252252 |
| 5 | 756756 |
| 6 | 2018016 |
| 7 | 4900896 |
| 8 | 11027016 |
| 9 | 23279256 |
| 10 | 46558512 |
| 11 | 88884432 |
| 12 | 162954792 |
| 13 | 288304632 |
| 14 | 494236512 |
| 15 | 823727520 |
| 16 | 1338557220 |
| 17 | 2125943820 |
| 18 | 3307023720 |
| 19 | 5047562520 |
| 20 | 7571343780 |
| 21 | 11176745580 |
| 22 | 16257084480 |
| 23 | 23325382080 |
| 24 | 33044291280 |