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A003400
as a simple table
n
a(n)
1
1
2
0
3
0
4
0
5
0
6
8
7
152
8
3696
9
135004
10
7971848
11
805364776
12
144123121972
[1,0,0,0,0,8,152,3696,135004,7971848,805364776, 144123121972]