-5812domain: ZAppears in sequencesFirst differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 203", based on the 5-celled von Neumann neighborhood.at n=43A270728Expansion of Product_{k>=1} ((1 - k*x^k)/(1 + k*x^k)).at n=26A292317