265001domain: NAppears in sequencesNumber of 1 up, 1 down, 2 up, 2 down, ... permutations of [n].at n=12A229551Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 814", based on the 5-celled von Neumann neighborhood.at n=9A273643