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 | 2 |
| 2 | 48 |
| 3 | 5760 |
| 4 | 5806080 |
| 5 | 75246796800 |
| 6 | 1780537083494400 |
| 7 | 115939740156316876800 |
| 8 | 19864514173849162481664000 |