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A164489 Number of binary strings of length n with no substrings equal to 0001 1011 or 1100 1
13, 20, 30, 45, 68, 103, 156, 236, 356, 536, 806, 1211, 1819, 2732, 4103, 6162, 9254, 13897, 20869, 31338, 47058, 70663, 106108, 159332, 239253, 359262, 539467, 810062, 1216386, 1826520, 2742694, 4118416, 6184193, 9286153, 13944040, 20938299 (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+6*x+10*x^2+2*x^3-11*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: A164475 A164483 A164468 * A164464 A164467 A164505

Adjacent sequences:  A164486 A164487 A164488 * A164490 A164491 A164492

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified May 9 06:22 EDT 2021. Contains 343692 sequences. (Running on oeis4.)