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A004056
as a simple table
n
a(n)
12
1
13
1
14
1
15
1
16
1
17
1
18
1
19
2
20
2
21
3
22
4
23
4
24
6
25
8
26
13
[1,1,1,1,1,1,1,2,2,3,4,4,6,8,13]
