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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 30 |
| 6 | 80 |
| 7 | 236 |
| 8 | 782 |
| 9 | 2872 |
| 10 | 11551 |
| 11 | 50208 |
| 12 | 233475 |
| 13 | 1153424 |
| 14 | 6022129 |
| 15 | 33094892 |
| 16 | 190798443 |
| 17 | 1150698311 |
| 18 | 7241821945 |
| 19 | 47455029775 |
| 20 | 323155438297 |
| 21 | 2282781968327 |
| 22 | 16700909857189 |
| 23 | 126356647220803 |
| 24 | 987303496571557 |
| 25 | 7957134024398329 |
| 26 | 66071773173223712 |