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0, 1, 4, 8, 15, 23, 33, 44, 59, 75, 93, 112, 134, 157, 182, 208, 239, 271, 305, 340, 378, 417, 458, 500, 546, 593, 642, 692, 745, 799, 855, 912, 975, 1039, 1105, 1172, 1242, 1313, 1386, 1460, 1538, 1617, 1698, 1780, 1865, 1951, 2039, 2128, 2222, 2317, 2414
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = Sum_{k=1..n} Sum_{j=0..n} floor(k/2^j).
G.f.: (1/(1-x))*Sum_{k>=0} x^(2^k)/((1-x)*(1-x^(2^k))).
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MAPLE
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b:= proc(n) option remember; `if`(n=0, 0, b(iquo(n, 2))+n) end:
a:= proc(n) option remember; `if`(n=0, 0, b(n)+a(n-1)) end:
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MATHEMATICA
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Accumulate[Table[2n-Count[IntegerDigits[2 n, 2], 1], {n, 0, 70}]] (* Harvey P. Dale, Oct 22 2011 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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