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A164437 Number of binary strings of length n with no substrings equal to 0000 0101 or 1111 1
13, 22, 37, 62, 104, 174, 292, 490, 821, 1376, 2308, 3870, 6487, 10876, 18237, 30576, 51261, 85946, 144102, 241600, 405064, 679140, 1138659, 1909078, 3200774, 5366466, 8997477, 15085240, 25292069, 42404978, 71096617, 119201278, 199854120 (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 (0,0,2,3,2,1).

FORMULA

G.f. -x^4*(13+22*x+37*x^2+36*x^3+21*x^4+8*x^5) / ( -1+2*x^3+3*x^4+2*x^5+x^6 ). - R. J. Mathar, Jan 19 2011

CROSSREFS

Sequence in context: A164446 A164506 A164440 * A164435 A164425 A164501

Adjacent sequences:  A164434 A164435 A164436 * A164438 A164439 A164440

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified December 17 10:14 EST 2018. Contains 318193 sequences. (Running on oeis4.)