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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 115 |
| 9 | 286 |
| 10 | 719 |
| 11 | 1842 |
| 12 | 4766 |
| 13 | 12485 |
| 14 | 32969 |
| 15 | 87795 |
| 16 | 235326 |
| 17 | 634664 |
| 18 | 1720573 |
| 19 | 4686829 |
| 20 | 12820504 |
| 21 | 35204254 |
| 22 | 97001655 |
| 23 | 268120807 |
| 24 | 743236814 |
| 25 | 2065709551 |
| 26 | 5755253457 |