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 | 54 |
| 6 | 767 |
| 7 | 10194 |
| 8 | 114028 |
| 9 | 1171524 |
| 10 | 11593345 |
| 11 | 112117864 |
| 12 | 1069300358 |
| 13 | 10109375268 |
| 14 | 95086492066 |
| 15 | 891766724342 |
| 16 | 8351325770872 |
| 17 | 78171510043913 |
| 18 | 731828924318516 |