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A169785
as a simple table
n
a(n)
0
1
1
7
2
31
3
127
4
499
5
1975
6
7855
7
31327
8
125119
9
500083
10
1999507
11
7996327
[1,7,31,127,499,1975,7855,31327,125119,500083, 1999507,7996327]