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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3507 |
| 5 | 66462606 |
| 6 | 2977635137862 |
| 7 | 283097260184159421 |
| 8 | 52469332407700365320163 |
| 9 | 17647883828569858659972268092 |
| 10 | 10148613081040117624319536901932188 |
| 11 | 9494356410654311931931879706070629989407 |
| 12 | 13859154719468565627065764000731047706917194485 |