801450

Appears in sequences

• Number of rooted labeled trees of height 2 such that every leaf is at a distance 2 from the root.at n=10A220232
• Triangular array read by rows. T(n,k) is the number of labeled rooted trees of height at most 2 with exactly k leaves at a distance 1 from the root, n>=1, 0<=k<=n-1.at n=45A220233