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A164489
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Number of binary strings of length n with no substrings equal to 0001 1011 or 1100
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1
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13, 20, 30, 45, 68, 103, 156, 236, 356, 536, 806, 1211, 1819, 2732, 4103, 6162, 9254, 13897, 20869, 31338, 47058, 70663, 106108, 159332, 239253, 359262, 539467, 810062, 1216386, 1826520, 2742694, 4118416, 6184193, 9286153, 13944040, 20938299
(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+6*x+10*x^2+2*x^3-11*x^4-4*x^5+8*x^6) / ( (x-1)*(x^6-x^4+x^2+x-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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