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 | 1 |
| 14 | 12 |
| 15 | 114 |
| 16 | 864 |
| 17 | 5541 |
| 18 | 30846 |
| 19 | 152596 |
| 20 | 681428 |
| 21 | 2783239 |
| 22 | 10504028 |
| 23 | 36943275 |
| 24 | 121939535 |
| 25 | 380006322 |
| 26 | 1123838933 |
| 27 | 3168283157 |
| 28 | 8547632165 |
| 29 | 22144509397 |
| 30 | 55260123176 |
| 31 | 133188829780 |
| 32 | 310810391963 |
| 33 | 703802522743 |
| 34 | 1549519595711 |