565280386625domain: NAppears in sequencesa(n) = Sum_{k=0..n} binomial(n,k)*binomial(2*k,k).at n=18A026375Self-convolution of array T given by A026374.at n=18A026946a(n) = Sum_{k=0..n} n^(n-k) * binomial(2*k,k) * binomial(2*n,2*k).at n=9A337388