a(n) = Product_{k=0..n} binomial(n + 2*k, k).

A390499

a(n) = Product_{k=0..n} binomial(n + 2*k, k).

Terms

    a(0) =1a(1) =3a(2) =60a(3) =8820a(4) =9979200a(5) =89278289100

External references