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A377568
as a simple table
n
a(n)
1
1
2
2
3
4
4
5
5
8
6
9
7
10
8
16
9
18
10
20
11
32
12
36
13
49
14
81
[1,2,4,5,8,9,10,16,18,20,32,36,49,81]
