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A217997
as a simple table
n
a(n)
1
81
2
6561
3
531143
4
43046713
5
3486751263
6
282429513233
7
22876783667859
8
1853020148203325
[81,6561,531143,43046713,3486751263,282429513233, 22876783667859,1853020148203325]