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A164442
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Number of binary strings of length n with no substrings equal to 0000 0111 or 1001
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1
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13, 21, 33, 51, 79, 122, 188, 289, 444, 682, 1047, 1607, 2466, 3784, 5806, 8908, 13667, 20968, 32169, 49353, 75716, 116161, 178210, 273403, 419444, 643494, 987222, 1514555, 2323567, 3564719, 5468842, 8390067, 12871687, 19747199, 30295319
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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4,1
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LINKS
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FORMULA
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G.f. -x^4*(-13-8*x+x^2+3*x^3+5*x^4+8*x^5) / ( (x-1)*(x^5+x^4+x^3+x^2-1) ). - R. J. Mathar, Jan 19 2011
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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