48771072000domain: NAppears in sequencesa(n) = 3*2^(2*n-1)*(n-1)*n^3*binomial(2*n,n)^2, a closed form for a triple binomial sum involving absolute values.at n=5A272913a(n) = (2*n)! / CatalanNumber(n - 1) for n >= 1 and a(0) = 1.at n=8A344057