41093domain: NAppears in sequencesa(n) = [ 3rd elementary symmetric function of {sqrt(k)} ], k = 1,2,...,n.at n=18A025194Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 393", based on the 5-celled von Neumann neighborhood.at n=41A271604