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A158291
as a simple table
n
a(n)
1
1
2
2
3
3
4
6
5
10
6
20
7
37
8
74
9
140
10
280
11
542
12
1084
13
2118
14
4236
15
8337
16
16674
[1,2,3,6,10,20,37,74,140,280,542,1084,2118,4236, 8337,16674]