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A109756
as a simple table
n
a(n)
1
7
2
31
3
109
4
349
5
1061
6
103
7
29
8
97
9
43
10
13
11
11
12
41
13
131
14
37
15
17
16
59
[7,31,109,349,1061,103,29,97,43,13,11,41,131,37, 17,59]