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A164506 Number of binary strings of length n with no substrings equal to 0011 0110 or 1001 1
13, 22, 37, 62, 104, 174, 291, 486, 812, 1356, 2265, 3782, 6316, 10546, 17611, 29406, 49104, 81992, 136913, 228614, 381744, 637430, 1064387, 1777302, 2967748, 4955524, 8274745, 13817126, 23071844, 38525274, 64329483, 107417166, 179365064 (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 (2,0,-2,3,-2)

FORMULA

G.f. -x^4*(-13+4*x+7*x^2-14*x^3+15*x^4) / ( (x-1)*(2*x^4-x^3+x^2+x-1) ). - R. J. Mathar, Jan 19 2011

CROSSREFS

Sequence in context: A164412 A164472 A164446 * A164440 A164437 A164435

Adjacent sequences:  A164503 A164504 A164505 * A164507 A164508 A164509

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified December 2 19:13 EST 2016. Contains 278683 sequences.