637430domain: NAppears in sequencesNumber of binary strings of length n with no substrings equal to 0011 0110 or 1001.at n=21A164506G.f. satisfies A(x) = A(x^2)/M(x), where M(x) = Sum_{n>=1} mu(n)*x^n and mu(n) = A008683(n), the Moebius function of n.at n=24A378260