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A018550
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
6
6
9
7
12
8
17
9
18
10
34
11
36
12
51
13
68
14
102
15
153
16
204
17
306
18
612
[1,2,3,4,6,9,12,17,18,34,36,51,68,102,153,204,306, 612]