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A018511
as a simple table
n
a(n)
1
1
2
2
3
3
4
6
5
7
6
13
7
14
8
21
9
26
10
39
11
42
12
78
13
91
14
182
15
273
16
546
[1,2,3,6,7,13,14,21,26,39,42,78,91,182,273,546]
