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 | 3 |
| 3 | 41 |
| 4 | 14120 |
| 5 | 207009649 |
| 6 | 193466859054994 |
| 7 | 16390021452000128467345 |
| 8 | 173238117954686651535535048940928 |
| 9 | 300679800156605267097630253972085058107938561 |