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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 30 |
| 7 | 107 |
| 8 | 396 |
| 9 | 1506 |
| 10 | 5848 |
| 11 | 23087 |
| 12 | 92381 |
| 13 | 373830 |
| 14 | 1527192 |
| 15 | 6290054 |
| 16 | 26090780 |
| 17 | 108895558 |
| 18 | 456992576 |
| 19 | 1927176941 |
| 20 | 8162557837 |
| 21 | 34708427777 |
| 22 | 148110582311 |
| 23 | 634074235584 |
| 24 | 2722547715302 |
| 25 | 11721572763762 |
| 26 | 50591504811439 |