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A268157
as a simple table
n
a(n)
1
0
2
1
3
8
4
36
5
456
6
6360
7
93600
8
1784160
9
38102400
10
899579520
11
23960966400
12
699741504000
[0,1,8,36,456,6360,93600,1784160,38102400, 899579520,23960966400,699741504000]