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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 31 |
| 5 | 106 |
| 6 | 386 |
| 7 | 1499 |
| 8 | 5755 |
| 9 | 21886 |
| 10 | 83854 |
| 11 | 323302 |
| 12 | 1248534 |
| 13 | 4828916 |
| 14 | 18719364 |
| 15 | 72711123 |
| 16 | 282867795 |
| 17 | 1101981430 |
| 18 | 4298723990 |
| 19 | 16788997874 |
| 20 | 65641296578 |
| 21 | 256895812108 |
| 22 | 1006307847324 |
| 23 | 3945185527582 |
| 24 | 15478851119966 |