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 | 1 |
| 2 | 5 |
| 3 | 22 |
| 4 | 95 |
| 5 | 411 |
| 6 | 1790 |
| 7 | 7855 |
| 8 | 34725 |
| 9 | 154573 |
| 10 | 692450 |
| 11 | 3120206 |
| 12 | 14135555 |
| 13 | 64356345 |
| 14 | 294341325 |
| 15 | 1351889910 |
| 16 | 6233399525 |
| 17 | 28845511125 |
| 18 | 133933280000 |
| 19 | 623811120960 |
| 20 | 2913924782375 |
| 21 | 13648296620445 |
| 22 | 64087737455725 |
| 23 | 301644762913977 |