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 | 15 |
| 5 | 48 |
| 6 | 164 |
| 7 | 583 |
| 8 | 2142 |
| 9 | 8062 |
| 10 | 30950 |
| 11 | 120651 |
| 12 | 476418 |
| 13 | 1901311 |
| 14 | 7656763 |
| 15 | 31074151 |
| 16 | 126963466 |
| 17 | 521820340 |
| 18 | 2155911512 |
| 19 | 8948711597 |
| 20 | 37299355151 |
| 21 | 156054201936 |
| 22 | 655134261795 |
| 23 | 2758885471920 |
| 24 | 11651193009013 |