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A164460 Number of binary strings of length n with no substrings equal to 0001 0011 or 1101 1
13, 21, 33, 50, 76, 115, 173, 261, 393, 591, 889, 1336, 2007, 3015, 4528, 6800, 10212, 15335, 23028, 34580, 51926, 77973, 117085, 175815, 264004, 396428, 595275, 893863, 1342221, 2015473, 3026425, 4544465, 6823946, 10246803, 15386547, 23104360 (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,-1,-1,1,1,-1).

FORMULA

G.f. -x^4*(-13+5*x+9*x^2+3*x^3-10*x^4-4*x^5+8*x^6) / ( (x-1)*(x^6-x^4+x^2+x-1) ). - R. J. Mathar, Jan 19 2011

CROSSREFS

Sequence in context: A164444 A164438 A164490 * A164448 A164424 A164450

Adjacent sequences:  A164457 A164458 A164459 * A164461 A164462 A164463

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified November 20 10:31 EST 2017. Contains 294963 sequences.