login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A164449 Number of binary strings of length n with no substrings equal to 0001 0010 or 1010 1
13, 21, 34, 56, 91, 147, 238, 386, 625, 1011, 1636, 2648, 4285, 6933, 11218, 18152, 29371, 47523, 76894, 124418, 201313, 325731, 527044, 852776, 1379821, 2232597, 3612418, 5845016, 9457435, 15302451, 24759886, 40062338, 64822225, 104884563 (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,-1,1,0,-1).

FORMULA

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

CROSSREFS

Sequence in context: A164497 A164503 A067516 * A164439 A164492 A164451

Adjacent sequences:  A164446 A164447 A164448 * A164450 A164451 A164452

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)