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A065657
as a simple table
n
a(n)
1
3
2
9
3
39
4
117
5
351
6
507
7
3417
8
10251
9
30753
10
58089
11
92259
12
656121
13
3870849
14
98845053
15
429262593
16
7508684661
[3,9,39,117,351,507,3417,10251,30753,58089,92259, 656121,3870849,98845053,429262593,7508684661]