43231domain: NAppears in sequencesa(n) = G_n(5), where G_n(k) is the Goodstein function defined in A266201.at n=22A266204Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 211", based on the 5-celled von Neumann neighborhood.at n=39A270899