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A052411
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
2
10
24
11
173
12
1047
13
6709
14
37177
15
224311
16
1301492
[0,0,0,0,0,0,0,0,2,24,173,1047,6709,37177,224311, 1301492]