56011

Appears in sequences

• Wedderburn-Etherington numbers: unlabeled binary rooted trees (every node has outdegree 0 or 2) with n endpoints (and 2n-1 nodes in all).at n=18A001190
• Number of n-node rooted unlabeled trees with outdegree <= 2 and exactly 1 edge at the root.at n=18A036656
• Number of 2 X n arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 2 X n array.at n=18A219579
• 1-Fibonacci lattice paths.at n=11A230122
• Number of rooted binary trees (in which all inner nodes have precisely two children) with n leaves and with maximal number of cherries (i.e., maximal number of pendant subtrees with two leaves).at n=35A344613