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A164467
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Number of binary strings of length n with no substrings equal to 0001 0100 or 1101
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1
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13, 20, 31, 48, 74, 113, 172, 261, 396, 600, 909, 1376, 2083, 3152, 4770, 7217, 10920, 16521, 24996, 37816, 57213, 86556, 130951, 198112, 299722, 453441, 686004, 1037837, 1570124, 2375400, 3593693, 5436808, 8225227, 12443744, 18825858
(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+9*x^2-12*x^3+8*x^4) / ( (x-1)*(x^4-x^3+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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