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A211004
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
7
6
9
7
12
8
15
9
18
10
22
11
26
12
30
13
35
14
40
15
45
16
51
[1,2,3,5,7,9,12,15,18,22,26,30,35,40,45,51]