346804

Appears in sequences

• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 486", based on the 5-celled von Neumann neighborhood.at n=9A272507
• Total number of runs of 1's in all length n binary words in which 1's occur in runs of at least 3.at n=24A387573
• a(n) = Sum_{k=0..n} (k+1) * binomial(2*k+1,2*n-2*k+1).at n=11A391890