a(n) = C(2n,n) * (7^n/n!^2) * Product_{k=0..n-1} (7k+1)*(7k+6).

A184896

a(n) = C(2n,n) * (7^n/n!^2) * Product_{k=0..n-1} (7k+1)*(7k+6).

Terms

    a(0) =1a(1) =84a(2) =45864a(3) =35672000a(4) =32445913500

External references