127912

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=19A001190
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 65 ones.at n=9A031833
• Number of n-node rooted unlabeled trees with outdegree <= 2 and exactly 1 edge at the root.at n=19A036656
• Triangle read by rows: T(n,k) (n>=1, 1 <= k <= n) = number of n-element unlabeled rigid interval posets of height k.at n=59A193357
• 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=37A344613