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A007375
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
1
7
2
8
1
9
1
10
8
11
1
12
1
13
1
14
21
15
7
16
1
17
1
[1,1,1,1,1,1,2,1,1,8,1,1,1,21,7,1,1]