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 | 0 |
| 2 | 0 |
| 3 | 64 |
| 4 | 7680 |
| 5 | 634880 |
| 6 | 4555898880 |
| 7 | 36661900345344 |
| 8 | 199424098393128960 |
| 9 | 5767554639734568386560 |
| 10 | 2536966895379879201142210560 |
| 11 | 884897682352177233989316141645824 |