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A164497
Number of binary strings of length n with no substrings equal to 0010 0110 or 1011.
1
13, 21, 34, 54, 87, 140, 227, 368, 597, 967, 1565, 2531, 4093, 6620, 10710, 17330, 28044, 45381, 73432, 118816, 192244, 311049, 503279, 814318, 1317598, 2131931, 3449554, 5581509, 9031072, 14612565, 23643597, 38256113, 61899677, 100155797
OFFSET
4,1
FORMULA
G.f.: -x^4*(13-5*x-8*x^2+12*x^3+8*x^4) / ( (x^2+x-1)*(x^3-x+1) ). - R. J. Mathar, Jan 19 2011
CROSSREFS
Sequence in context: A164481 A164433 A164479 * A164503 A164449 A164439
KEYWORD
nonn,easy
AUTHOR
R. H. Hardin, Aug 14 2009
STATUS
approved