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A241703
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
1
6
3
7
25
8
378
9
14306
10
1141575
11
164245876
12
39637942895
[0,0,0,0,1,3,25,378,14306,1141575,164245876, 39637942895]