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 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 8 |
| 6 | 24 |
| 7 | 62 |
| 8 | 150 |
| 9 | 338 |
| 10 | 738 |
| 11 | 1568 |
| 12 | 3282 |
| 13 | 6780 |
| 14 | 13904 |
| 15 | 28288 |
| 16 | 57342 |
| 17 | 115812 |
| 18 | 233426 |
| 19 | 469656 |
| 20 | 944000 |
| 21 | 1895194 |
| 22 | 3802762 |
| 23 | 7625328 |
| 24 | 15284798 |
| 25 | 30626642 |
| 26 | 61353084 |
| 27 | 122872144 |
| 28 | 246042562 |
| 29 | 492592948 |
| 30 | 986089652 |
| 31 | 1973756116 |
| 32 | 3950330140 |
| 33 | 7905541650 |
| 34 | 15819942048 |
| 35 | 31655323370 |