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A187404
as a simple table
n
a(n)
1
25
2
1751
3
426425
4
397056235
5
1500716036725
6
24045057041759375
7
1689575552125034440625
[25,1751,426425,397056235,1500716036725, 24045057041759375,1689575552125034440625]