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 | 20 |
| 3 | 156 |
| 4 | 1668 |
| 5 | 17360 |
| 6 | 194908 |
| 7 | 2371824 |
| 8 | 31056188 |
| 9 | 430029780 |
| 10 | 6194026170 |
| 11 | 91889614586 |