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A003035
as a simple table
n
a(n)
1
0
2
0
3
1
4
1
5
2
6
4
7
6
8
7
9
10
10
12
11
16
12
19
13
22
14
26
[0,0,1,1,2,4,6,7,10,12,16,19,22,26]