Triangle read by rows: T(n,k) is the number of ordered trees with n edges and k branches.
1, 1, 1, 1, 2, 2, 1, 3, 6, 4, 1, 4, 12, 16, 9, 1, 5, 20, 40, 45, 21, 1, 6, 30, 80, 135, 126, 51
1 seqfan posts
Tue Mar 8 04:27:35 CET 2011 [seqfan] Catalan triangles, polynomials and basket weaving