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4, 7, 9, 11, 14, 16, 18, 21, 25, 29, 31, 33, 36, 40, 44, 46, 48, 51, 54, 57, 61, 64, 67, 71, 75, 79, 81, 83, 86, 89, 92, 96, 99, 102, 106, 110, 114, 116, 118, 121, 123, 125, 128, 130, 132, 135, 138, 141, 145, 147, 149, 152, 154, 156, 159, 162, 165, 169, 172
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Conjecture: a(n)/n -> 2.91..., and if m denotes this number, then -1 < m - a(n)/n) < 1 for n >= 1.
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LINKS
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Clark Kimberling, Table of n, a(n) for n = 1..10000
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MATHEMATICA
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s = {0, 0}; w[0] = StringJoin[Map[ToString, s]];
w[n_] := StringReplace[w[n - 1], {"00" -> "0101", "10" -> "001"}]
Table[w[n], {n, 0, 8}]
st = ToCharacterCode[w[18]] - 48 (* A288508 *)
Flatten[Position[st, 0]] (* A288509 *)
Flatten[Position[st, 1]] (* A288510 *)
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CROSSREFS
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Cf. A288508, A288510.
Sequence in context: A310945 A310946 A265140 * A233473 A109180 A025054
Adjacent sequences: A288507 A288508 A288509 * A288511 A288512 A288513
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KEYWORD
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nonn,easy
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AUTHOR
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Clark Kimberling, Jun 12 2017
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STATUS
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approved
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