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 | 1 |
| 4 | 24 |
| 5 | 360 |
| 6 | 4000 |
| 7 | 39330 |
| 8 | 367912 |
| 9 | 3370604 |
| 10 | 30630980 |
| 11 | 277824572 |
| 12 | 2522478772 |
| 13 | 22959239730 |
| 14 | 209629138108 |
| 15 | 1920548559328 |