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 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 26 |
| 6 | 84 |
| 7 | 297 |
| 8 | 1066 |
| 9 | 3976 |
| 10 | 15093 |
| 11 | 58426 |
| 12 | 229189 |
| 13 | 910127 |
| 14 | 3649165 |
| 15 | 14756491 |
| 16 | 60103220 |
| 17 | 246357081 |
| 18 | 1015406251 |
| 19 | 4205873378 |
| 20 | 17497745509 |
| 21 | 73084575666 |
| 22 | 306352303774 |
| 23 | 1288328048865 |
| 24 | 5433980577776 |
| 25 | 22982025183983 |