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 | 4 |
| 4 | 12 |
| 5 | 31 |
| 6 | 73 |
| 7 | 162 |
| 8 | 344 |
| 9 | 707 |
| 10 | 1416 |
| 11 | 2778 |
| 12 | 5358 |
| 13 | 10188 |
| 14 | 19139 |
| 15 | 35582 |
| 16 | 65556 |
| 17 | 119825 |
| 18 | 217487 |
| 19 | 392286 |
| 20 | 703618 |
| 21 | 1255669 |
| 22 | 2230608 |
| 23 | 3946020 |
| 24 | 6954060 |
| 25 | 12212280 |
| 26 | 21377365 |
| 27 | 37309288 |
| 28 | 64935132 |
| 29 | 112726771 |
| 30 | 195224773 |
| 31 | 337343034 |
| 32 | 581700476 |