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A187733
as a simple table
n
a(n)
1
3
2
5
3
13
4
137
5
523
6
524309
7
134217757
8
8589934627
9
178405961588244985132285746181186892047843477
[3,5,13,137,523,524309,134217757,8589934627, 178405961588244985132285746181186892047843477]