188004domain: NAppears in sequencesGuttmann-Torrie series coefficients rho_n*c_{n}^{2} for square lattice, with wedge angle Pi/2.at n=9A259802Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 390", based on the 5-celled von Neumann neighborhood.at n=9A271599