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A316926
as a simple table
n
a(n)
1
1
2
4
3
25
4
1719
5
467377
6
504420842
7
2110655397816
8
33990477458950173
9
2097232699194056398870
[1,4,25,1719,467377,504420842,2110655397816, 33990477458950173,2097232699194056398870]