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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 12 |
| 7 | 49 |
| 8 | 482 |
| 9 | 6380 |
| 10 | 135252 |
| 11 | 3939509 |
| 12 | 166800470 |
| 13 | 9739584172 |
| 14 | 818717312364 |
| 15 | 95353226103276 |