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A028738
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
8
6
10
7
12
8
13
9
15
10
17
11
18
12
20
13
22
14
23
[2,3,5,7,8,10,12,13,15,17,18,20,22,23]