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 | 362880 |
| 2 | 3628800 |
| 3 | 39916800 |
| 4 | 355687428096000 |
| 5 | 304888344611713860501504000000 |
| 6 | 371993326789901217467999448150835200000000 |