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A076088
as a simple table
n
a(n)
1
9
2
81
3
19683
4
1679616
5
205962976
6
68719476736
7
6722988818432
8
248155780267521
[9,81,19683,1679616,205962976,68719476736, 6722988818432,248155780267521]