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 | 3 |
| 2 | 25 |
| 3 | 480 |
| 4 | 20657 |
| 5 | 1906051 |
| 6 | 378639419 |
| 7 | 163267272113 |
| 8 | 155845755656250 |
| 9 | 335843460383424796 |
| 10 | 1664976879959626195703 |
| 11 | 19289660262281670383124691 |
| 12 | 529079225669745804554669074826 |
| 13 | 34719352972951195290492954195861372 |