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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 30 |
| 8 | 1155 |
| 9 | 29910 |
| 10 | 601364 |
| 11 | 10260804 |
| 12 | 156469887 |
| 13 | 2195431068 |
| 14 | 28897471080 |
| 15 | 361514582340 |
| 16 | 4339280187364 |
| 17 | 50323775391144 |
| 18 | 566914469842923 |
| 19 | 6229721664499224 |
| 20 | 67000302262906866 |
| 21 | 707159710965012834 |
| 22 | 7341038807584085816 |
| 23 | 75093327553430134548 |