a(n) = Product_{k=1..L} hypergeom([-n, -n], [1], k) with L = 4.

A301393

a(n) = Product_{k=1..L} hypergeom([-n, -n], [1], k) with L = 4.

Terms

    a(0) =1a(1) =120a(2) =56628a(3) =41983200a(4) =38244074820

External references