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A238530
as a simple table
n
a(n)
1
2
2
8
3
22
4
166
5
778
6
4962
7
29922
8
179682
9
688078
10
7060198
11
42361338
12
674524645
[2,8,22,166,778,4962,29922,179682,688078,7060198, 42361338,674524645]