5581485

Appears in sequences

• Level of the first leaf (in preorder traversal) of a ternary tree, summed over all ternary trees with n edges. A ternary tree is a rooted tree in which each vertex has at most three children and each child of a vertex is designated as its left or middle or right child.at n=8A121447
• a(n) is the Wiener index of the Lucas cube L_n.at n=14A238420