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A164462
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Number of binary strings of length n with no substrings equal to 0001 0100 or 0101.
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1
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13, 20, 33, 55, 89, 143, 232, 377, 610, 986, 1596, 2584, 4181, 6764, 10945, 17711, 28657, 46367, 75024, 121393, 196418, 317810, 514228, 832040, 1346269, 2178308, 3524577, 5702887, 9227465, 14930351, 24157816, 39088169, 63245986, 102334154
(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-6*x^2+4*x^3+8*x^4) / ( (x-1)*(x^2+1)*(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,easy
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AUTHOR
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STATUS
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approved
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