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A264708
as a simple table
n
a(n)
1
1
2
8
3
152
4
4544
5
202176
6
10964160
7
1200365568
8
150015836160
9
27805483008000
[1,8,152,4544,202176,10964160,1200365568, 150015836160,27805483008000]