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) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 3 |
| 8 | 11 |
| 9 | 38 |
| 10 | 250 |
| 11 | 2171 |
| 12 | 25518 |
| 13 | 388854 |
| 14 | 7283110 |
| 15 | 171355621 |
| 16 | 4915591680 |
| 17 | 174203813967 |
| 18 | 7526329299531 |