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A023646
as a simple table
n
a(n)
2
1
3
2
4
3
5
3
6
7
7
3
8
7
9
7
10
11
11
3
12
20
13
5
14
10
15
15
[1,2,3,3,7,3,7,7,11,3,20,5,10,15]
