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A164484 Number of binary strings of length n with no substrings equal to 0001 0111 or 1100 1
13, 20, 31, 48, 74, 114, 175, 268, 410, 626, 955, 1456, 2218, 3378, 5143, 7828, 11914, 18130, 27587, 41976, 63866, 97170, 147839, 224924, 342202, 520626, 792075, 1205056, 1833354, 2789234, 4243495, 6455972, 9821994, 14942994, 22733971 (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 (2,0,0,-3,2).

FORMULA

G.f. -x^4*(13-6*x-9*x^2-14*x^3+17*x^4) / ( (2*x^3+x^2-1)*(x-1)^2 ). - R. J. Mathar, Jan 19 2011

CROSSREFS

Sequence in context: A164464 A164467 A164505 * A164502 A164474 A164478

Adjacent sequences:  A164481 A164482 A164483 * A164485 A164486 A164487

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 14 2009

STATUS

approved

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Last modified August 20 20:09 EDT 2017. Contains 290837 sequences.