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A306574
as a simple table
n
a(n)
1
2
2
3
3
4
4
4
5
5
6
4
7
5
8
6
9
4
10
5
11
6
12
5
13
7
14
5
15
5
16
6
17
6
18
7
19
6
20
6
21
8
22
6
23
6
24
6
[2,3,4,4,5,4,5,6,4,5,6,5,7,5,5,6,6,7,6,6,8,6,6,6]