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A241843
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
6
6
54
7
581
8
9503
9
249169
10
11607032
11
1005452874
12
164042264045
13
50335602558672
14
29003480904157108
[0,0,0,1,6,54,581,9503,249169,11607032,1005452874, 164042264045,50335602558672,29003480904157108]