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A066089
as a simple table
n
a(n)
1
2
2
3
3
10
4
12
5
52
6
188
7
1175
8
4840
9
25168
10
90992
11
896368
12
8164112
13
30997008
14
233151408
15
2111839632
[2,3,10,12,52,188,1175,4840,25168,90992,896368, 8164112,30997008,233151408,2111839632]