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 A164459 Number of binary strings of length n with no substrings equal to 0001 0011 or 1100 1
 13, 21, 35, 58, 96, 159, 264, 439, 730, 1215, 2023, 3369, 5612, 9349, 15576, 25952, 43241, 72050, 120054, 200043, 333329, 555423, 925499, 1542157, 2569695, 4281884, 7134907, 11888905, 19810501, 33010271, 55005074, 91655056, 152724992 (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 (2,0,0,-2,1,-1,1). FORMULA G.f. -x^4*(13-5*x-7*x^2-12*x^3+6*x^4-4*x^5+8*x^6) / ( (x^5+x^4+2*x^3+x^2-1)*(x-1)^2 ). - R. J. Mathar, Jan 19 2011 a(0)=13, a(1)=21, a(2)=35, a(3)=58, a(4)=96, a(5)=159, a(6)=264, a(n)= 2*a(n-1)-2*a(n-4)+a(n-5)-a(n-6)+a(n-7) [From Harvey P. Dale, May 06 2011] MATHEMATICA LinearRecurrence[{2, 0, 0, -2, 1, -1, 1}, {13, 21, 35, 58, 96, 159, 264}, 40] (* May 06 2011 *) CROSSREFS Sequence in context: A034292 A163113 A164496 * A164453 A164465 A164471 Adjacent sequences: A164456 A164457 A164458 * A164460 A164461 A164462 KEYWORD nonn AUTHOR R. H. Hardin Aug 14 2009 STATUS approved

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Last modified March 1 20:05 EST 2024. Contains 370443 sequences. (Running on oeis4.)