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A029551
as a simple table
n
a(n)
0
0
1
2
2
2
3
2
4
2
5
3
6
4
7
4
8
4
9
4
10
4
11
4
12
6
13
6
14
6
15
6
16
6
17
6
[0,2,2,2,2,3,4,4,4,4,4,4,6,6,6,6,6,6]