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) |
|---|---|
| 15 | 1 |
| 16 | 3 |
| 17 | 13 |
| 18 | 37 |
| 19 | 134 |
| 20 | 466 |
| 21 | 1916 |
| 22 | 9409 |
| 23 | 46006 |
| 24 | 255714 |
| 25 | 1525052 |
| 26 | 9524779 |
| 27 | 58944302 |
| 28 | 355219704 |
| 29 | 2315784192 |
| 30 | 14568780212 |
| 31 | 97993669291 |
| 32 | 619342933593 |