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A164407 Number of binary strings of length n with no substrings equal to 0000 0001 or 0010 1
13, 23, 40, 71, 124, 218, 382, 671, 1177, 2066, 3625, 6362, 11164, 19592, 34381, 60335, 105880, 185807, 326068, 572210, 1004158, 1762175, 3092401, 5426786, 9523345, 16712306, 29328052, 51467144, 90318541, 158497991, 278144584, 488109719 (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, 0, 1).

FORMULA

G.f.: x^4*(13+10*x+4*x^2+8*x^3)/((1+x)*(1-2*x+x^2-x^3)). - R. J. Mathar, Nov 28 2011

MATHEMATICA

LinearRecurrence[{1, 1, 0, 1}, {13, 23, 40, 71}, 50] (* G. C. Greubel, Sep 19 2017 *)

PROG

(PARI) x='x+O('x^50); Vec(x^4*(13+10*x+4*x^2+8*x^3)/((1+x)*(1-2*x+x^2-x^3))) \\ G. C. Greubel, Sep 19 2017

CROSSREFS

Sequence in context: A164491 A164434 A164494 * A259216 A339867 A135283

Adjacent sequences:  A164404 A164405 A164406 * A164408 A164409 A164410

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 14 2009

STATUS

approved

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Last modified December 6 22:42 EST 2021. Contains 349567 sequences. (Running on oeis4.)