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) |
|---|---|
| 13 | 2 |
| 14 | 3 |
| 15 | 17 |
| 16 | 41 |
| 17 | 140 |
| 18 | 389 |
| 19 | 1182 |
| 20 | 3369 |
| 21 | 9817 |
| 22 | 27903 |
| 23 | 79936 |
| 24 | 226784 |
| 25 | 645730 |
| 26 | 1831574 |
| 27 | 5204271 |
| 28 | 14766828 |
| 29 | 41938778 |
| 30 | 119061270 |