-5399

Appears in sequences

• G.f. A(x) satisfies A(A(A(x))) = x+3*x^2+9*x^3.at n=8A220288
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 377", based on the 5-celled von Neumann neighborhood.at n=43A271464