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A164473 Number of binary strings of length n with no substrings equal to 0001 0101 or 1011 1
13, 21, 34, 53, 82, 128, 198, 305, 471, 726, 1117, 1720, 2648, 4074, 6269, 9647, 14842, 22835, 35134, 54054, 83162, 127947, 196847, 302848, 465933, 716838, 1102852, 1696736, 2610425, 4016129, 6178802, 9506069, 14625054, 22500596, 34617094 (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 (2,-1,1,-1,0,1,-1).

FORMULA

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

CROSSREFS

Sequence in context: A057200 A164454 A164426 * A164481 A164433 A164479

Adjacent sequences:  A164470 A164471 A164472 * A164474 A164475 A164476

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified September 18 04:22 EDT 2021. Contains 347508 sequences. (Running on oeis4.)