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) |
|---|---|
| 1 | 0 |
| 2 | 13 |
| 3 | 3 |
| 4 | 68 |
| 5 | 242 |
| 6 | 917 |
| 7 | 3417 |
| 8 | 14533 |
| 9 | 58845 |
| 10 | 244155 |
| 11 | 1024766 |
| 12 | 4297121 |
| 13 | 17950575 |
| 14 | 75199021 |
| 15 | 314755111 |
| 16 | 1317874937 |
| 17 | 5519233903 |
| 18 | 23115442566 |
| 19 | 96811939884 |
| 20 | 405493370013 |
| 21 | 1698383143180 |
| 22 | 7113695019637 |
| 23 | 29796021993208 |
| 24 | 124802553668569 |