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 | 7 |
| 6 | 17 |
| 7 | 36 |
| 8 | 94 |
| 9 | 237 |
| 10 | 658 |
| 11 | 1845 |
| 12 | 5527 |
| 13 | 16809 |
| 14 | 53357 |
| 15 | 173298 |
| 16 | 580331 |
| 17 | 1988935 |
| 18 | 6991328 |
| 19 | 25124511 |
| 20 | 92325353 |
| 21 | 346401296 |
| 22 | 1326493369 |