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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 80 |
| 4 | 21964800 |
| 5 | 74836825861835980800000 |
| 6 | 2606654998899867556195703676289609067340669424836280320000000000 |