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A156077
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a(n) = #{1<=k<=n : A000002(k)=1}.
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10
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1, 1, 1, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 7, 7, 8, 9, 9, 9, 10, 10, 11, 12, 12, 13, 13, 13, 14, 15, 15, 16, 17, 17, 18, 18, 18, 19, 19, 19, 20, 21, 21, 22, 22, 22, 23, 23, 24, 25, 25, 26, 27, 27, 27, 28, 28, 28, 29, 30, 30, 31, 31, 31, 32, 32, 32, 33, 34, 34, 35, 36, 36, 37, 37, 37, 38
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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a2 = {1, 2, 2}; Do[ a2 = Join[a2, {1 + Mod[n - 1, 2]}], {n, 3, 60}, {i, 1, a2[[n]]}]; a3 = Accumulate[a2]; 2*Range[Length[a3]] - a3 (* Jean-François Alcover, Jun 18 2013 *)
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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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