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 | 2 |
| 2 | 7 |
| 3 | 45 |
| 4 | 431 |
| 5 | 5677 |
| 6 | 97304 |
| 7 | 2086120 |
| 8 | 54337094 |
| 9 | 1681862711 |
| 10 | 60786960947 |
| 11 | 2529205845825 |