48641

Appears in sequences

• Numbers n such that A229964(n) = 3.at n=29A229966
• G.f.: Sum_{n>=0} x^n / (1-2*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * 2^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].at n=6A249921
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 131", based on the 5-celled von Neumann neighborhood.at n=7A270222
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 833", based on the 5-celled von Neumann neighborhood.at n=7A273676