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A187733 as a simple table

na(n)
13
25
313
4137
5523
6524309
7134217757
88589934627
9178405961588244985132285746181186892047843477

[3,5,13,137,523,524309,134217757,8589934627,
 178405961588244985132285746181186892047843477]