209190911domain: NAppears in sequencesT(4,n) with T(n,m) as in A063394.at n=18A063397Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 57", based on the 5-celled von Neumann neighborhood.at n=31A278662