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A164475 Number of binary strings of length n with no substrings equal to 0001 0101 or 1110 1
13, 20, 30, 44, 63, 90, 128, 180, 253, 356, 498, 696, 975, 1362, 1900, 2656, 3709, 5172, 7222, 10084, 14063, 19626, 27400, 38220, 53325, 74436, 103850, 144880, 202207, 282146, 393620, 549304, 766509, 1069396, 1492238, 2082332, 2905311, 4053882 (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 (1,0,2,-1,-1).

FORMULA

G.f. -x^4*(-13-7*x-10*x^2+12*x^3+8*x^4) / ( (x-1)*(x^4+2*x^3-1) ). - R. J. Mathar, Jan 19 2011

CROSSREFS

Sequence in context: A171143 A058016 A096277 * A164483 A164468 A164489

Adjacent sequences:  A164472 A164473 A164474 * A164476 A164477 A164478

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)