login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A290969
as a simple table
n
a(n)
0
1
1
7
2
31
3
32767
4
4095
5
435356467
6
16777215
7
68719476735
8
281474976710655
[1,7,31,32767,4095,435356467,16777215,68719476735, 281474976710655]