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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 12 |
| 7 | 22 |
| 8 | 61 |
| 9 | 128 |
| 10 | 335 |
| 11 | 756 |
| 12 | 1936 |
| 13 | 4580 |
| 14 | 11652 |
| 15 | 28402 |
| 16 | 72209 |
| 17 | 179460 |
| 18 | 457274 |
| 19 | 1151725 |
| 20 | 2945129 |
| 21 | 7489680 |
| 22 | 19228598 |
| 23 | 49256157 |
| 24 | 126958030 |
| 25 | 327072560 |
| 26 | 846173899 |
| 27 | 2190012371 |
| 28 | 5685200054 |
| 29 | 14770728584 |
| 30 | 38463268482 |
| 31 | 100259225816 |