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 | 4 |
| 3 | 26 |
| 4 | 236 |
| 5 | 2780 |
| 6 | 40642 |
| 7 | 715836 |
| 8 | 14873174 |
| 9 | 358866952 |
| 10 | 9934283924 |
| 11 | 312461402424 |