773745domain: NAppears in sequencesG.f.: x*(1 - 2*x^2)/(1 - x - 3*x^2 - 3*x^3 - x^4).at n=16A114723Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 902", based on the 5-celled von Neumann neighborhood.at n=10A273759