3018060

Appears in sequences

• a(n) = (n-1)*(n-2)*(n-3)*(3*n-10)*3^(n-5)/4.at n=10A086864
• Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k leaves (i.e., vertices of degree 0; n>=0, k>=1). 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=39A120429
• Number of length 3+2 0..n arrays with the medians of every three consecutive terms nondecreasing.at n=21A250142