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A006926
as a simple table
n
a(n)
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
1
8
1
9
5
10
32
11
385
12
7573
13
181224
14
4624480
15
122089998
16
3328899586
17
93988909755
[0,0,0,0,0,0,0,1,1,5,32,385,7573,181224,4624480, 122089998,3328899586,93988909755]