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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 1 |
| 6 | 8 |
| 7 | 8 |
| 8 | 48 |
| 9 | 54 |
| 10 | 331 |
| 11 | 439 |
| 12 | 2558 |
| 13 | 3734 |
| 14 | 21057 |
| 15 | 33384 |
| 16 | 182293 |
| 17 | 307719 |
| 18 | 1638465 |
| 19 | 2913775 |
| 20 | 15181584 |
| 21 | 28194412 |
| 22 | 144206012 |
| 23 | 277887666 |
| 24 | 1398566992 |