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A220245
as a simple table
n
a(n)
1
4
2
37
3
816
4
7140
5
64258
6
660677
7
6228324
8
59704733
9
580593280
10
5565851685
11
53535536290
[4,37,816,7140,64258,660677,6228324,59704733, 580593280,5565851685,53535536290]