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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 5 |
| 7 | 28 |
| 8 | 102 |
| 9 | 242 |
| 10 | 835 |
| 11 | 3381 |
| 12 | 10115 |
| 13 | 39415 |
| 14 | 138555 |
| 15 | 465778 |
| 16 | 1741167 |
| 17 | 6081563 |
| 18 | 22156403 |
| 19 | 81090107 |
| 20 | 301185788 |
| 21 | 1098440558 |
| 22 | 4071519963 |
| 23 | 15235221189 |
| 24 | 56764430821 |
| 25 | 211797564907 |
| 26 | 790029575790 |
| 27 | 2962705350767 |
| 28 | 11154931819979 |
| 29 | 42097079364709 |