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A006683
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
6
6
8
7
11
8
15
9
21
10
28
11
39
12
53
13
99
14
137
15
186
[1,2,3,4,6,8,11,15,21,28,39,53,99,137,186]