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A165234
as a simple table
n
a(n)
1
2
2
17
3
3
4
1481
5
5
6
149
7
569
8
2081
9
2339
10
5939831
11
11
12
33164857769
[2,17,3,1481,5,149,569,2081,2339,5939831,11, 33164857769]