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 | 3 |
| 2 | 8 |
| 3 | 34 |
| 4 | 144 |
| 5 | 377 |
| 6 | 1597 |
| 7 | 4181 |
| 8 | 17711 |
| 9 | 75025 |
| 10 | 196418 |
| 11 | 832040 |
| 12 | 3524578 |
| 13 | 9227465 |
| 14 | 39088169 |
| 15 | 102334155 |
| 16 | 433494437 |
| 17 | 1836311903 |
| 18 | 4807526976 |
| 19 | 20365011074 |
| 20 | 53316291173 |
| 21 | 225851433717 |
| 22 | 956722026041 |
| 23 | 2504730781961 |
| 24 | 10610209857723 |