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A006810
as a simple table
n
a(n)
0
1
1
3
2
9
3
27
4
78
5
225
6
633
7
1785
8
4944
9
13742
10
37686
11
103767
12
282425
13
772719
[1,3,9,27,78,225,633,1785,4944,13742,37686,103767, 282425,772719]