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A206894
as a simple table
n
a(n)
1
4
2
256
3
211548
4
2408811358
5
369048436354154
6
768965608329861602588
7
21727183867324671091396681434
[4,256,211548,2408811358,369048436354154, 768965608329861602588, 21727183867324671091396681434]