22937600domain: NAppears in sequencesa(n) = 2^n*(n^2 - n + 8)/8.at n=19A081908Decimal 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 141", based on the 5-celled von Neumann neighborhood.at n=26A279148