229204domain: NAppears in sequencesNumber of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 454", based on the 5-celled von Neumann neighborhood.at n=9A272277Number of pairs (lambda,mu) of partitions lambda of n and mu of 10 with mu <= lambda (by diagram containment).at n=21A303860