1059838domain: NAppears in sequencesNumber of rooted trees with n nodes and a single labeled node; pointed rooted trees; vertebrates.at n=15A000107T(n,k)=Number of nXk arrays of permutations of 0..n*k-1 with rows nondecreasing modulo 5 and columns nondecreasing modulo 7.at n=31A264837