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A228018
as a simple table
n
a(n)
1
9
2
49
3
243
4
961
5
16129
6
67092481
7
17179607041
8
274876858369
9
4611686014132420609
[9,49,243,961,16129,67092481,17179607041, 274876858369,4611686014132420609]