n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 40 |
4 | 1608 |
5 | 2585680 |
6 | 6685741062420 |
7 | 44699133553728910336256592 |
8 | 1998012540454093724746522398047564450017935663454544 |
[1,2,6,40,1608,2585680,6685741062420, 44699133553728910336256592, 19980125404540937247465223980475644500179356634545\ 44] |