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A153571
as a simple table
n
a(n)
0
1
1
2
2
8
3
64
4
1023
5
27824
6
1518130
7
161027087
8
32975856442
9
12956875592101
10
9739126432448652
[1,2,8,64,1023,27824,1518130,161027087, 32975856442,12956875592101,9739126432448652]