72678

Appears in sequences

• Number of nodes at the n-th level of the Inverse-Totient-Tree (ITT) with the root at 1, and edges connecting number m to all numbers k such that phi(k) = m.at n=14A058811
• Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,3,1,0,4 for x=0,1,2,3,4.at n=8A196741
• T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,3,1,0,4 for x=0,1,2,3,4.at n=57A196746
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 539", based on the 5-celled von Neumann neighborhood.at n=41A272803
• Number of nX5 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=6A298151
• Number of n X 7 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=4A298153
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=59A298154
• a(n) = Sum_{k=1..n} k^3 * tau(k), where tau is A000005.at n=15A320895