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 | 16 |
| 6 | 170 |
| 7 | 1549 |
| 8 | 13253 |
| 9 | 110970 |
| 10 | 928822 |
| 11 | 7862353 |
| 12 | 67758488 |
| 13 | 596837558 |
| 14 | 5385257886 |
| 15 | 49837119320 |
| 16 | 473321736911 |
| 17 | 4614233950422 |
| 18 | 46168813528478 |
| 19 | 474017189673555 |
| 20 | 4992024759165631 |
| 21 | 53902161267878974 |
| 22 | 596448192670732180 |
| 23 | 6760141422115666131 |
| 24 | 78438566784031690720 |