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) |
|---|---|
| 13 | 1 |
| 14 | 6 |
| 15 | 28 |
| 16 | 128 |
| 17 | 558 |
| 18 | 2421 |
| 19 | 10675 |
| 20 | 47810 |
| 21 | 217572 |
| 22 | 1006211 |