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A005139
as a simple table
n
a(n)
0
0
1
1
2
2
3
2
4
2
5
2
6
3
7
3
8
4
9
5
10
7
11
8
12
10
13
13
14
19
15
24
16
36
17
53
[0,1,2,2,2,2,3,3,4,5,7,8,10,13,19,24,36,53]