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A005832
as a simple table
n
a(n)
1
1
2
4
3
324
4
21233664
5
3240000000000000000
6
25786061996226338865429872640000000000000000
[1,4,324,21233664,3240000000000000000, 25786061996226338865429872640000000000000000]