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A050598
as a simple table
n
a(n)
1
5
2
13
3
15
4
31
5
77
6
151
7
181
8
245
9
445
10
447
11
883
12
1037
13
3557
14
43733
15
290861
16
464887
17
530181
[5,13,15,31,77,151,181,245,445,447,883,1037,3557, 43733,290861,464887,530181]