240374016

Appears in sequences

• a(n) is the number of subsets of {1..n} that contain 5 even and 5 odd numbers.at n=40A331576
• Square array read by ascending antidiagonals: T(n,k) = (2*k)!/k!^2 * ( (2*n*k)! * ((n + 2)*k)! )/( (n*k)! * ((n + 1)*k)!^2 ) for n, k > = 0.at n=33A364509
• a(n) = binomial(4*n, n)^2.at n=5A364510