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 | 6 |
| 4 | 22 |
| 5 | 92 |
| 6 | 421 |
| 7 | 2062 |
| 8 | 10646 |
| 9 | 57324 |
| 10 | 319436 |
| 11 | 1831585 |
| 12 | 10758458 |
| 13 | 64513454 |
| 14 | 393846399 |
| 15 | 2442328993 |
| 16 | 15356020884 |
| 17 | 97741913382 |
| 18 | 628994116349 |
| 19 | 4087863691061 |
| 20 | 26805206933158 |
| 21 | 177198351316543 |
| 22 | 1180073345351131 |
| 23 | 7912190584017869 |
| 24 | 53380776660751987 |