31675383808domain: NAppears in sequencesExpansion of g.f. (1+2*x)/(1-2*x)^2.at n=29A014480Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 217", based on the 5-celled von Neumann neighborhood.at n=34A286741