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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 6 |
| 8 | 12 |
| 9 | 28 |
| 10 | 68 |
| 11 | 184 |
| 12 | 526 |
| 13 | 1602 |
| 14 | 5075 |
| 15 | 16711 |
| 16 | 56428 |
| 17 | 195003 |
| 18 | 685649 |
| 19 | 2447882 |
| 20 | 8850157 |
| 21 | 32359428 |
| 22 | 119492766 |
| 23 | 445236635 |
| 24 | 1672636369 |
| 25 | 6331624545 |
| 26 | 24138404479 |
| 27 | 92640942148 |
| 28 | 357805122286 |
| 29 | 1390318899884 |
| 30 | 5433781135206 |