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A276495
as a simple table
n
a(n)
1
1
2
127
3
251
4
1657
5
1777
6
1973
7
3181
8
21893
9
31951
10
50839
11
67607
12
138977
[1,127,251,1657,1777,1973,3181,21893,31951,50839, 67607,138977]