68954

Appears in sequences

• Number of series-reduced planted trees with n leaves. Also the number of essentially series series-parallel networks with n edges; also the number of essentially parallel series-parallel networks with n edges.at n=12A000669
• a(n) = 4 + 8*n + 10*n^2 + 4*n^3.at n=25A100207
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 2,0,1,0,0,0,0 for x=0,1,2,3,4,5,6.at n=5A195899