219429

Appears in sequences

• Number of (k,m,n)-antichains of multisets with k=3 and m=2.at n=6A084874
• Triangle read by rows: number of hex trees with n edges and k branches of length 1 (0<=k<=n).at n=55A126321
• Number of hex trees with n edges and no branches of length 1.at n=10A126322