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A067215
as a simple table
n
a(n)
0
1
1
8
2
64
3
10088
4
82112704
5
32701809796548
6
664942846307414508064
7
717494365786942428294915062416
[1,8,64,10088,82112704,32701809796548, 664942846307414508064, 717494365786942428294915062416]