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 | 1 |
| 2 | 6 |
| 3 | 279936 |
| 4 | 1679616 |
| 5 | 10077696 |
| 6 | 60466176 |
| 7 | 13060694016 |
| 8 | 4849687664788584363858837602739217760256 |
| 9 | 174588755932389037098918153698611839369216 |