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A164450 Number of binary strings of length n with no substrings equal to 0001 0010 or 1011 1
13, 21, 33, 51, 78, 119, 181, 275, 417, 632, 957, 1449, 2193, 3319, 5022, 7599, 11497, 17395, 26317, 39816, 60237, 91133, 137873, 208587, 315566, 477415, 722269, 1092707, 1653129, 2500984, 3783677, 5724241, 8660065, 13101615, 19821118 (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,-2,2,-1).

FORMULA

G.f. -x^4*(-13+5*x+9*x^2-11*x^3+8*x^4) / ( (x-1)*(x^4-x^3+x^2+x-1) ). - R. J. Mathar, Jan 19 2011

CROSSREFS

Sequence in context: A164460 A164448 A164424 * A164461 A164499 A164442

Adjacent sequences: A164447 A164448 A164449 * A164451 A164452 A164453

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified December 7 19:19 EST 2022. Contains 358669 sequences. (Running on oeis4.)