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 | 6 |
| 6 | 54 |
| 7 | 581 |
| 8 | 9503 |
| 9 | 249169 |
| 10 | 11607032 |
| 11 | 1005452874 |
| 12 | 164042264045 |
| 13 | 50335602558672 |
| 14 | 29003480904157108 |