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A086789
as a simple table
n
a(n)
0
1
1
1
2
2
3
8
4
64
5
1023
6
32071
7
1823707
8
163947848
9
20402420291
10
3209997749284
[1,1,2,8,64,1023,32071,1823707,163947848, 20402420291,3209997749284]