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n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 20 |
3 | 1960 |
4 | 18819920 |
5 | 1735166549767840 |
6 | 14749861913749949808286047759680 |
7 | 1065814268211609269094400465471990022332221793124358274759711360 |
[1,2,20,1960,18819920,1735166549767840, 14749861913749949808286047759680, 10658142682116092690944004654719900223322217931243\ 58274759711360] |