85990654178domain: NAppears in sequencesa(n) = (binomial(4*n, 2*n) + binomial(2*n, n)^2)/2.at n=10A036910a(n) = (binomial(4*n, 2*n) + (-1)^n*binomial(2*n, n)^2)/2.at n=10A036911a(n) = Sum_{k=0..10} binomial(20,k)*binomial(n,k).at n=20A247615a(n) = Sum_{k=0..floor(n/2)} binomial(n, k)^2.at n=20A277247