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 | 20 |
| 4 | 1610 |
| 5 | 129654 |
| 6 | 11688369 |
| 7 | 1194822915 |
| 8 | 137766789810 |
| 9 | 17758192128830 |
| 10 | 2535895233070628 |
| 11 | 397875362655895761 |
| 12 | 68087081506276861665 |
| 13 | 12626853606957534296975 |
| 14 | 2523446241515288646389325 |