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 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 51 |
| 6 | 1538 |
| 7 | 599871 |
| 8 | 19417825808 |
| 9 | 1573273218577214751 |
| 10 | 124442887685693556895657990772138 |
| 11 | 311057821480221188367831306672353513246409033360367599771 |