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 | 50 |
| 6 | 191 |
| 7 | 795 |
| 8 | 3625 |
| 9 | 17781 |
| 10 | 93319 |
| 11 | 519732 |
| 12 | 3056185 |
| 13 | 18880345 |
| 14 | 122066437 |
| 15 | 823118881 |
| 16 | 5772473719 |
| 17 | 41995743085 |
| 18 | 316258151517 |
| 19 | 2460542117337 |
| 20 | 19743544526463 |
| 21 | 163138014893817 |
| 22 | 1386173917051704 |
| 23 | 12096681529032989 |
| 24 | 108293699332498981 |