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A050547
as a simple table
n
a(n)
1
7
2
31
3
67
4
251
5
767
6
1171
7
1643
8
25423
9
38863
10
50867
11
60391
12
100303
13
286171
14
399767
[7,31,67,251,767,1171,1643,25423,38863,50867, 60391,100303,286171,399767]