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A123509
as a simple table
n
a(n)
1
1
2
3
3
5
4
9
5
13
6
17
7
21
8
27
9
33
10
41
11
47
12
55
13
65
14
73
15
81
16
93
17
105
18
117
19
129
20
141
21
153
22
165
23
181
24
197
25
213
[1,3,5,9,13,17,21,27,33,41,47,55,65,73,81,93,105, 117,129,141,153,165,181,197,213]