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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 11 |
| 6 | 131 |
| 7 | 17291 |
| 8 | 298995963 |
| 9 | 89398586189293211 |
| 10 | 7992107212644486930829797919966571 |
| 11 | 63873777698404030240264509605345282496735163325301838600463378485931 |