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A163791
as a simple table
n
a(n)
1
3
2
9
3
27
4
47
5
63
6
185
7
617
8
15189
9
56411
10
182439
11
271607
12
658521
[3,9,27,47,63,185,617,15189,56411,182439,271607, 658521]