A077585 - OEIS

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A077585 as a simple table

n	a(n)
0	0
1	1
2	7
3	127
4	32767
5	2147483647
6	9223372036854775807
7	170141183460469231731687303715884105727
8	57896044618658097711785492504343953926634992332820282019728792003956564819967

[0,1,7,127,32767,2147483647,9223372036854775807, 170141183460469231731687303715884105727, 57896044618658097711785492504343953926634992332820\ 282019728792003956564819967]