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A277626
as a simple table
n
a(n)
1
1
2
3
3
15
4
255
5
65535
6
4139059
7
15734689
8
66322477
9
83623935
10
4294967295
[1,3,15,255,65535,4139059,15734689,66322477, 83623935,4294967295]