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) |
|---|---|
| 2 | 1 |
| 3 | 48 |
| 4 | 284112 |
| 5 | 335750676480 |
| 6 | 112249362914249932800 |
| 7 | 14994936423694913432308324761600 |