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A097142
as a simple table
n
a(n)
1
3
2
16
3
112
4
818
5
6367
6
52299
7
442972
8
3840740
9
33898001
10
303369367
11
2745366812
12
25071938615
[3,16,112,818,6367,52299,442972,3840740,33898001, 303369367,2745366812,25071938615]