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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 27 |
| 7 | 1463 |
| 8 | 5350936 |
| 9 | 154615586811211 |
| 10 | 1295349936263652139582251464117 |
| 11 | 6137049788665571444030885529267632764941063995324839557922175605 |