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 | 0 |
| 4 | 1 |
| 5 | 10 |
| 6 | 75 |
| 7 | 522 |
| 8 | 3579 |
| 9 | 24670 |
| 10 | 172198 |
| 11 | 1219974 |
| 12 | 8776255 |
| 13 | 64082132 |
| 14 | 474605417 |
| 15 | 3562460562 |
| 16 | 27079243352 |
| 17 | 208281537572 |