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A011994
as a simple table
n
a(n)
6
2
7
4
8
0
9
3
10
21
11
0
12
180
13
253
14
0
15
2981
16
21742
17
0
18
320760
[2,4,0,3,21,0,180,253,0,2981,21742,0,320760]