26593domain: NAppears in sequencesa(n) = (2*n^3 + 5*n^2 + 7*n)/2.at n=28A162264Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 441", based on the 5-celled von Neumann neighborhood.at n=32A272223