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A317177
as a simple table
n
a(n)
1
1
2
2
3
2
4
3
5
4
6
5
7
7
8
9
9
10
10
13
11
16
12
18
13
22
14
25
15
27
16
31
17
38
18
37
[1,2,2,3,4,5,7,9,10,13,16,18,22,25,27,31,38,37]