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A164425 Number of binary strings of length n with no substrings equal to 0000 0010 or 1111 1
13, 22, 37, 62, 105, 177, 298, 502, 846, 1426, 2403, 4049, 6823, 11498, 19376, 32651, 55021, 92718, 156243, 263291, 443681, 747663, 1259915, 2123130, 3577765, 6029024, 10159732, 17120542, 28850461, 48616982, 81926280, 138057015, 232645000 (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 (1,0,1,1,1).

FORMULA

G.f. -x^4*(13+9*x+15*x^2+12*x^3+8*x^4) / ( -1+x+x^3+x^4+x^5 ). - R. J. Mathar, Dec 01 2011

CROSSREFS

Sequence in context: A164440 A164437 A164435 * A164501 A164495 A164427

Adjacent sequences:  A164422 A164423 A164424 * A164426 A164427 A164428

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified March 30 16:27 EDT 2017. Contains 284302 sequences.