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A005861
as a simple table
n
a(n)
9
1
10
1
11
1
12
1
13
1
14
1
15
1
16
2
17
2
18
2
19
2
20
2
21
3
22
3
23
3
24
4
25
5
26
6
27
6
28
7
[1,1,1,1,1,1,1,2,2,2,2,2,3,3,3,4,5,6,6,7]