n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 56 |
4 | 11440 |
5 | 129024480 |
6 | 13136858812224 |
7 | 614965786737727286400 |
8 | 23665616042362569982121184000 |
9 | 4818341997044953599090397918009939136000 |
[1,4,56,11440,129024480,13136858812224, 614965786737727286400, 23665616042362569982121184000, 4818341997044953599090397918009939136000] |