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) |
|---|---|
| 5 | 1 |
| 6 | 12 |
| 7 | 168 |
| 8 | 2464 |
| 9 | 38808 |
| 10 | 657972 |
| 11 | 11997216 |
| 12 | 234594360 |
| 13 | 4903616718 |
| 14 | 109205019924 |
| 15 | 2582909885556 |
| 16 | 64686057980544 |
| 17 | 1710536977653504 |
| 18 | 47637803779229664 |
| 19 | 1393903719674129664 |
| 20 | 42758329987344875904 |
| 21 | 1372254504736418142840 |
| 22 | 45989719374155059863360 |