a(n) = numerator( (4*n+1)*(Product_{i=1..n} (2*i-1)/Product_{i=1..n} 2*i)^5 ).

A074799

a(n) = numerator( (4*n+1)*(Product_{i=1..n} (2*i-1)/Product_{i=1..n} 2*i)^5 ).

Terms

    a(0) =1a(1) =5a(2) =2187a(3) =40625a(4) =892871875a(5) =20841167403

External references