-5883

Appears in sequences

• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 305", based on the 5-celled von Neumann neighborhood.at n=43A271163
• a(n) = -(1/n) * Sum_{d|n} phi(n/d) * (-3)^d.at n=9A343465