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 | 1330 |
| 8 | 6905220 |
| 9 | 7279892361 |
| 10 | 3717889913655 |
| 11 | 1255470137209650 |
| 12 | 326123611416074340 |
| 13 | 70993993399632155710 |
| 14 | 13659118629343706026053 |
| 15 | 2405832308811599670396135 |
| 16 | 397496768417871214784702640 |
| 17 | 62693059156926401902640364120 |
| 18 | 9561367292987041683030275944320 |