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 | 1 |
| 4 | 3 |
| 5 | 15 |
| 6 | 93 |
| 7 | 794 |
| 8 | 10850 |
| 9 | 259700 |
| 10 | 11706739 |
| 11 | 1006609723 |
| 12 | 164058686415 |
| 13 | 50335888444167 |
| 14 | 29003487017067011 |
| 15 | 31397381129017616776 |
| 16 | 63969560112658419275907 |
| 17 | 245871831682052901418048916 |