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A223755
as a simple table
n
a(n)
1
4
2
256
3
61733
4
26631193
5
15947472102
6
12025063773557
7
10962346407561257
8
11777774040586957640
[4,256,61733,26631193,15947472102,12025063773557, 10962346407561257,11777774040586957640]