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A107431
as a simple table
n
a(n)
2
3
3
5
4
4
5
7
6
4
7
5
8
9
9
7
10
5
11
6
12
11
13
8
14
7
15
6
16
3
17
13
18
10
19
9
[3,5,4,7,4,5,9,7,5,6,11,8,7,6,3,13,10,9]