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A066008
as a simple table
n
a(n)
1
9
2
23
3
180
4
1325
5
10334
6
83556
7
710667
8
6148698
9
54619717
10
491432596
11
4471325309
12
40951585117
[9,23,180,1325,10334,83556,710667,6148698, 54619717,491432596,4471325309,40951585117]