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A163783
as a simple table
n
a(n)
1
3
2
5
3
27
4
89
5
1139
6
1219
7
1921
8
2155
9
5775
10
9047
11
12437
12
78785
13
105909
14
197559
15
1062657
[3,5,27,89,1139,1219,1921,2155,5775,9047,12437, 78785,105909,197559,1062657]