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 | 1 |
| 2 | 6 |
| 3 | 105 |
| 4 | 3710 |
| 5 | 219625 |
| 6 | 19545316 |
| 7 | 2437990653 |
| 8 | 405899413380 |
| 9 | 87002614878795 |
| 10 | 23351252019790310 |
| 11 | 7676367378822833691 |
| 12 | 3035533054438876836390 |
| 13 | 1422385798272704860377055 |
| 14 | 779768824083518449340320720 |