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A003208
as a simple table
n
a(n)
0
1
1
6
2
18
3
54
4
162
5
456
6
1302
7
3630
8
10158
9
27648
10
77022
11
206508
12
570072
13
1521822
[1,6,18,54,162,456,1302,3630,10158,27648,77022, 206508,570072,1521822]