-4165

Appears in sequences

• a(n) = sum(sum(binomial(j-n-1,m),m=0..n),j=0..n).at n=7A092785
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 229", based on the 5-celled von Neumann neighborhood.at n=37A270949