85649domain: NAppears in sequencesNumber of binary strings of length n with no substrings equal to 0001, 1010, or 1100.at n=27A164487Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 438", based on the 5-celled von Neumann neighborhood.at n=8A272218