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A164424
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Number of binary strings of length n with no substrings equal to 0000 0010 or 1101.
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1
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13, 21, 33, 51, 78, 118, 178, 268, 403, 605, 907, 1359, 2036, 3050, 4568, 6840, 10241, 15333, 22957, 34371, 51458, 77038, 115334, 172668, 258503, 387005, 579383, 867391, 1298568, 1944082, 2910476, 4357256, 6523221, 9765877, 14620441, 21888179
(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+5*x-4*x^2-6*x^3+4*x^4+8*x^5) / ( (x-1)*(x^5+x^4+x-1) ). - R. J. Mathar, Dec 01 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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