1,2

Sum(k*binomial(n, k-1)*binomial(3*n-2*k-1, n-k)/(2*n-k), k=1..n)

Sequence in context: A158691 A038171 A074516 this_sequence A074529 A143916 A020033

Adjacent sequences: A045737 A045738 A045739 this_sequence A045741 A045742 A045743

nonn

Emeric Deutsch (deutsch(AT)duke.poly.edu)