The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 344881152000 |
| 3 | 2208058019165981638656000000 |
| 4 | 1369986068925795885347091500568179543900160000000000 |
| 5 | 363392722685428853076589064611759104109572860599125858715484081356800000000000000000 |
[1,720,344881152000,2208058019165981638656000000, 13699860689257958853470915005681795439001600000000\ 00, 36339272268542885307658906461175910410957286059912\ 5858715484081356800000000000000000] |