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A186963
as a simple table
n
a(n)
1
2
2
2
3
2
4
3
5
4
6
3
7
4
8
5
9
4
10
4
11
6
12
5
13
6
14
7
15
6
16
7
17
6
[2,2,2,3,4,3,4,5,4,4,6,5,6,7,6,7,6]