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A108395
as a simple table
n
a(n)
1
1
2
2
3
12
4
288
5
161280
6
1393920
7
61479419904000
8
592612475535360
9
6670903752021072936960
[1,2,12,288,161280,1393920,61479419904000, 592612475535360,6670903752021072936960]