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A028740
as a simple table
n
a(n)
1
2
2
3
3
5
4
6
5
8
6
11
7
12
8
14
9
15
10
17
11
18
12
20
13
21
14
23
15
24
16
26
[2,3,5,6,8,11,12,14,15,17,18,20,21,23,24,26]