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A059803
as a simple table
n
a(n)
1
2
2
7
3
29
4
31
5
67
6
149
7
401
8
2531
9
19913
10
30773
11
53857
12
170099
[2,7,29,31,67,149,401,2531,19913,30773,53857, 170099]