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A180210
as a simple table
n
a(n)
1
1
2
2
3
4
4
8
5
16
6
32
7
64
8
128
9
258
10
536
11
1190
12
2918
13
7954
14
23914
15
76404
[1,2,4,8,16,32,64,128,258,536,1190,2918,7954, 23914,76404]