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A086821
as a simple table
n
a(n)
0
1
1
1
2
1
3
3
4
7
5
15
6
35
7
87
8
217
9
547
10
1417
11
3735
12
9911
13
26513
14
71581
15
194681
16
532481
[1,1,1,3,7,15,35,87,217,547,1417,3735,9911,26513, 71581,194681,532481]