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A155042
as a simple table
n
a(n)
1
0
2
1
3
2
4
5
5
9
6
21
7
39
8
82
9
162
10
330
11
652
12
1321
13
2625
[0,1,2,5,9,21,39,82,162,330,652,1321,2625]