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 | 3 |
| 3 | 8 |
| 4 | 22 |
| 5 | 65 |
| 6 | 209 |
| 7 | 732 |
| 8 | 2780 |
| 9 | 11377 |
| 10 | 49863 |
| 11 | 232768 |
| 12 | 1151914 |
| 13 | 6018785 |
| 14 | 33087205 |
| 15 | 190780212 |
| 16 | 1150653920 |
| 17 | 7241710929 |
| 18 | 47454745803 |
| 19 | 323154696184 |
| 20 | 2282779990494 |
| 21 | 16700904488705 |
| 22 | 126356632390297 |
| 23 | 987303454928972 |
| 24 | 7957133905608836 |
| 25 | 66071772829247409 |