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 | 2 |
| 3 | 10 |
| 4 | 34 |
| 5 | 146 |
| 6 | 1036 |
| 7 | 5692 |
| 8 | 36380 |
| 9 | 323164 |
| 10 | 2394136 |
| 11 | 19863416 |
| 12 | 210278872 |
| 13 | 1937685400 |