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) |
|---|---|
| 19 | 1 |
| 20 | 3 |
| 21 | 15 |
| 22 | 44 |
| 23 | 179 |
| 24 | 741 |
| 25 | 2989 |
| 26 | 13932 |
| 27 | 79433 |
| 28 | 456134 |
| 29 | 3096812 |
| 30 | 21083037 |
| 31 | 151022325 |
| 32 | 1119202826 |
| 33 | 8627014654 |