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A005458
as a simple table
n
a(n)
0
1
1
2
2
3
3
4
4
6
5
8
6
9
7
10
8
11
9
12
10
28
11
35
12
36
13
60
14
156
[1,2,3,4,6,8,9,10,11,12,28,35,36,60,156]