73372

Appears in sequences

• Number of branches in all binary trees with n edges. A binary tree is a rooted tree in which each vertex has at most two children and each child of a vertex is designated as its left or right child.at n=8A121686
• a(n) is the smallest number which has in its English name the letter "o" in the n-th position, or -1 if no such number exists.at n=41A164789