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A221775
as a simple table
n
a(n)
1
8
2
372
3
16384
4
703148
5
30088757
6
1287149604
7
55062005315
8
2355484567486
9
100765156040153
[8,372,16384,703148,30088757,1287149604, 55062005315,2355484567486,100765156040153]