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A138097
as a simple table
n
a(n)
1
1
2
3
3
4
4
6
5
8
6
9
7
11
8
13
9
15
10
17
11
18
12
20
13
22
14
23
15
25
16
28
17
30
[1,3,4,6,8,9,11,13,15,17,18,20,22,23,25,28,30]