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 | 7 |
| 4 | 32 |
| 5 | 160 |
| 6 | 830 |
| 7 | 4405 |
| 8 | 23798 |
| 9 | 130498 |
| 10 | 724748 |
| 11 | 4069258 |
| 12 | 23064608 |
| 13 | 131809108 |
| 14 | 758696492 |
| 15 | 4394825647 |
| 16 | 25600773272 |
| 17 | 149877922228 |
| 18 | 881394158558 |
| 19 | 5204245242208 |
| 20 | 30841413359186 |
| 21 | 183381577399006 |
| 22 | 1093695670905206 |