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%I #13 Mar 31 2024 01:57:10
%S 13,20,30,45,68,103,156,236,356,536,806,1211,1819,2732,4103,6162,9254,
%T 13897,20869,31338,47058,70663,106108,159332,239253,359262,539467,
%U 810062,1216386,1826520,2742694,4118416,6184193,9286153,13944040,20938299
%N Number of binary strings of length n with no substrings equal to 0001 1011 or 1100.
%H R. H. Hardin, <a href="/A164489/b164489.txt">Table of n, a(n) for n=4..500</a>
%H <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (2,0,-1,-1,1,1,-1).
%F G.f.: -x^4*(-13+6*x+10*x^2+2*x^3-11*x^4-4*x^5+8*x^6) / ( (x-1)*(x^6-x^4+x^2+x-1) ). - _R. J. Mathar_, Jan 19 2011
%K nonn,easy
%O 4,1
%A _R. H. Hardin_, Aug 14 2009
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