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 | 4 |
| 2 | 12 |
| 3 | 24 |
| 4 | 360 |
| 5 | 8640 |
| 6 | 191520 |
| 7 | 5261760 |
| 8 | 152409600 |
| 9 | 5100641280 |
| 10 | 185547801600 |
| 11 | 7528468147200 |
| 12 | 332352865152000 |
| 13 | 16021626356736000 |
| 14 | 833951543820595200 |
| 15 | 46760641270447104000 |
| 16 | 2806459172660183040000 |