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A271516
as a simple table
n
a(n)
1
0
2
0
3
12
4
3192
5
1460310
6
1400351232
7
2894119482336
8
13177722597521472
9
135132206434712566080
[0,0,12,3192,1460310,1400351232,2894119482336, 13177722597521472,135132206434712566080]