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A077790
as a simple table
n
a(n)
1
3
2
7
3
15
4
23
5
27
6
35
7
59
8
63
9
67
10
155
11
1867
12
3111
13
23517
14
235415
[3,7,15,23,27,35,59,63,67,155,1867,3111,23517, 235415]