41312domain: NAppears in sequencesNumber of 2 X 2 matrices having all terms in {1,...,n} and positive determinant.at n=16A211059Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 473", based on the 5-celled von Neumann neighborhood.at n=38A272425