a(n) = [x^(3*n)] Product_{k=0..n-1} (1 + k*x)^4.

A384027

a(n) = [x^(3*n)] Product_{k=0..n-1} (1 + k*x)^4.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1296a(5) =2764800a(6) =8041766400

External references