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A215796
as a simple table
n
a(n)
1
1
2
1
3
2
4
4
5
9
6
20
7
48
8
115
9
283
10
691
11
1681
12
3988
13
9241
14
20681
15
44217
16
89644
[1,1,2,4,9,20,48,115,283,691,1681,3988,9241,20681, 44217,89644]