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A295262
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
13
6
23
7
43
8
83
9
163
10
317
11
631
12
1259
13
2503
14
4001
[2,3,5,7,13,23,43,83,163,317,631,1259,2503,4001]