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A164438 Number of binary strings of length n with no substrings equal to 0000 0110 or 0111 1
13, 21, 32, 49, 73, 109, 161, 238, 350, 515, 756, 1110, 1628, 2388, 3501, 5133, 7524, 11029, 16165, 23693, 34725, 50894, 74590, 109319, 160216, 234810, 344132, 504352, 739165, 1083301, 1587656, 2326825, 3410129, 4997789, 7324617, 10734750 (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 (1,1,0,0,-1).

FORMULA

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

CROSSREFS

Sequence in context: A164458 A164452 A164444 * A164490 A164460 A164448

Adjacent sequences:  A164435 A164436 A164437 * A164439 A164440 A164441

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified May 17 19:34 EDT 2021. Contains 343988 sequences. (Running on oeis4.)