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A292882
as a simple table
n
a(n)
0
1
1
0
2
126
3
4032
4
228690
5
14394240
6
1020623940
7
78353170560
8
6393827197170
[1,0,126,4032,228690,14394240,1020623940, 78353170560,6393827197170]