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A185449
as a simple table
n
a(n)
1
1
2
2
3
4
4
6
5
8
6
10
7
11
8
15
9
18
10
27
11
34
12
36
13
44
14
49
15
51
16
61
[1,2,4,6,8,10,11,15,18,27,34,36,44,49,51,61]