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A317061
as a simple table
n
a(n)
1
1
2
4
3
25
4
1595
5
384535
6
354399907
7
1197129513001
8
14769904681663624
9
663063103032213149999
[1,4,25,1595,384535,354399907,1197129513001, 14769904681663624,663063103032213149999]