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 | 87178291200 |
| 2 | 8841761993739701954543616000000 |
| 3 | 8222838654177922817725562880000000 |
| 4 | 8683317618811886495518194401280000000 |