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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 21 |
| 7 | 103 |
| 8 | 752 |
| 9 | 7385 |
| 10 | 91939 |
| 11 | 1345933 |
| 12 | 22170664 |
| 13 | 401399440 |
| 14 | 7887389438 |
| 15 | 166897766824 |
| 16 | 3781593764772 |