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A164430 Number of binary strings of length n with no substrings equal to 0000 0011 or 1100 1
13, 21, 36, 62, 105, 178, 303, 516, 878, 1494, 2543, 4329, 7369, 12544, 21354, 36352, 61884, 105349, 179343, 305309, 519751, 884813, 1506288, 2564276, 4365376, 7431537, 12651316, 21537377, 36664853, 62417606, 106258647, 180892877 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

R. H. Hardin, Table of n, a(n) for n=4..500

Index entries for linear recurrences with constant coefficients, signature (1,1,1,0,-1,-1,-1).

FORMULA

G.f. -x^4*(-13-8*x-2*x^2+8*x^3+14*x^4+12*x^5+8*x^6)/(1-x-x^2-x^3+x^5+x^6+x^7). - R. J. Mathar, Jan 19 2011

CROSSREFS

Sequence in context: A164423 A164422 A164500 * A045679 A137194 A053659

Adjacent sequences: A164427 A164428 A164429 * A164431 A164432 A164433

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified November 28 05:56 EST 2022. Contains 358407 sequences. (Running on oeis4.)