a(n) = C(2n,n) * (7^n/n!^2) * Product_{k=0..n-1} (7k+2)*(7k+5).

A185402

a(n) = C(2n,n) * (7^n/n!^2) * Product_{k=0..n-1} (7k+2)*(7k+5).

Terms

    a(0) =1a(1) =140a(2) =79380a(3) =62563200a(4) =57288340200

External references