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 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 9 |
| 4 | 40 |
| 5 | 218 |
| 6 | 1377 |
| 7 | 9285 |
| 8 | 65039 |
| 9 | 465888 |
| 10 | 3385778 |
| 11 | 24864272 |
| 12 | 184115213 |
| 13 | 1372589329 |
| 14 | 10291503008 |
| 15 | 77544953479 |