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 | 4 |
| 2 | 68 |
| 3 | 790 |
| 4 | 10704 |
| 5 | 142792 |
| 6 | 1937900 |
| 7 | 26264018 |
| 8 | 356533300 |
| 9 | 4838763426 |
| 10 | 65677043240 |
| 11 | 891388869206 |