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 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 24 |
| 5 | 125 |
| 6 | 576 |
| 7 | 3136 |
| 8 | 24752 |
| 9 | 242280 |
| 10 | 2421000 |
| 11 | 23568743 |
| 12 | 230156136 |
| 13 | 2370756505 |
| 14 | 26664718080 |
| 15 | 326641069815 |
| 16 | 4243004068192 |
| 17 | 57065900282730 |
| 18 | 787656999701016 |
| 19 | 11193821784313606 |
| 20 | 165023822310642520 |
| 21 | 2535785869709189307 |
| 22 | 40583218821499596176 |