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A347639
as a simple table
n
a(n)
0
1
1
3
2
7
3
27
4
117
5
1149
6
9946
7
147292
8
2763601
9
78714365
10
2826640715
[1,3,7,27,117,1149,9946,147292,2763601,78714365, 2826640715]