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 | 7 |
| 5 | 43 |
| 6 | 302 |
| 7 | 2622 |
| 8 | 31129 |
| 9 | 564452 |
| 10 | 17585400 |
| 11 | 1006927107 |
| 12 | 107458067322 |