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) |
|---|---|
| 4 | 24 |
| 5 | 480 |
| 6 | 7200 |
| 7 | 100800 |
| 8 | 1411200 |
| 9 | 20321280 |
| 10 | 304819200 |
| 11 | 4790016000 |
| 12 | 79035264000 |
| 13 | 1369944576000 |
| 14 | 24932991283200 |
| 15 | 475993469952000 |
| 16 | 9519869399040000 |
| 17 | 199184959733760000 |
| 18 | 4353614119895040000 |
| 19 | 99262401933606912000 |
| 20 | 2357482045923164160000 |