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A243246
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
8
6
68
7
709
8
10540
9
258623
10
11704072
11
1006628171
12
164059321534
13
50335903460830
14
29003487412989468
[0,0,0,0,8,68,709,10540,258623,11704072, 1006628171,164059321534,50335903460830, 29003487412989468]