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A065711
as a simple table
n
a(n)
2
1
3
-1
4
4
5
-24
6
2304
7
368640
8
6210846720
9
2086844497920
10
27369126116720640000
[1,-1,4,-24,2304,368640,6210846720,2086844497920, 27369126116720640000]