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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 33 |
| 5 | 260 |
| 6 | 2690 |
| 7 | 27244 |
| 8 | 290795 |
| 9 | 3163283 |
| 10 | 35166019 |
| 11 | 397017205 |
| 12 | 4541634029 |
| 13 | 52510663807 |