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 | 12 |
| 3 | 60480 |
| 4 | 871782912000 |
| 5 | 129260083694424883200000 |
| 6 | 516657398319307246483332566876160000000 |
| 7 | 120690846038545150966716699071685590652292228448256000000000 |