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A037163
as a simple table
n
a(n)
0
1
1
2
2
2
3
4
4
6
5
12
6
20
7
39
8
71
9
137
10
261
11
511
12
995
13
1974
14
3915
15
7841
16
15749
17
31835
[1,2,2,4,6,12,20,39,71,137,261,511,995,1974,3915, 7841,15749,31835]