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A003871
as a simple table
n
a(n)
1
1
2
1
3
6
4
6
5
14
6
14
7
14
8
14
9
15
10
15
11
20
12
21
13
21
14
35
15
35
[1,1,6,6,14,14,14,14,15,15,20,21,21,35,35]