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A164491
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Number of binary strings of length n with no substrings equal to 0010 0100 or 1001.
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1
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13, 23, 40, 70, 122, 213, 371, 647, 1128, 1967, 3430, 5981, 10429, 18185, 31709, 55291, 96411, 168112, 293137, 511143, 891280, 1554125, 2709928, 4725302, 8239510, 14367235, 25052150, 43683438, 76170818, 132819068, 231596631, 403835084
(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+10*x+4*x^2+7*x^3+12*x^4+8*x^5) / ( -1+x+x^2+x^5+x^6 ). - R. J. Mathar, Jan 19 2011
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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