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 | 3 |
| 5 | 88 |
| 6 | 1175 |
| 7 | 12249 |
| 8 | 119465 |
| 9 | 1119585 |
| 10 | 10347754 |
| 11 | 94842255 |
| 12 | 866077378 |
| 13 | 7902711871 |
| 14 | 72161896629 |
| 15 | 659999185093 |
| 16 | 6049187645033 |
| 17 | 55574520617432 |
| 18 | 511833282299754 |