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A081191
as a simple table
n
a(n)
0
1
1
9
2
82
3
756
4
7048
5
66384
6
631072
7
6048576
8
58388608
9
567108864
10
5536870912
[1,9,82,756,7048,66384,631072,6048576,58388608, 567108864,5536870912]