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A291171
as a simple table
n
a(n)
1
2
2
4
3
6
4
8
5
10
6
11
7
13
8
15
9
17
10
20
11
22
12
24
13
26
14
28
15
29
16
31
17
33
18
35
[2,4,6,8,10,11,13,15,17,20,22,24,26,28,29,31,33, 35]