215808domain: NAppears in sequencesG.f. A(x) satisfies: A(x) = Sum_{n>=0} (4*n)!/(n!)^4 * x^n / A(x)^n.at n=3A262010Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 185", based on the 5-celled von Neumann neighborhood.at n=8A270635