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A227724
as a simple table
n
a(n)
0
0
1
0
2
1
3
0
4
3
5
0
6
0
7
7
8
0
9
7
10
0
11
15
12
0
13
105
14
750
[0,0,1,0,3,0,0,7,0,7,0,15,0,105,750]