66964domain: NAppears in sequencesa(n) = min( x : x^4 + n^4 = 0 mod (x+n-1) ).at n=13A066487Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 214", based on the 5-celled von Neumann neighborhood.at n=8A270906