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A125093
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Triangle T(n,k) = n*A054525(n,k) read by rows.
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3
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1, -2, 2, -3, 0, 3, 0, -4, 0, 4, -5, 0, 0, 0, 5, 6, -6, -6, 0, 0, 6, -7, 0, 0, 0, 0, 0, 7, 0, 0, 0, -8, 0, 0, 0, 8, 0, 0, -9, 0, 0, 0, 0, 0, 9, 10, -10, 0, 0, -10, 0, 0, 0, 0, 10, -11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 12, 0, -12, 0, -12, 0, 0, 0, 0, 0, 12, -13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 14, -14, 0, 0, 0, 0, -14, 0, 0, 0, 0, 0, 0, 14, 15, 0, -15, 0
(list;
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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First few rows of the triangle are:
1;
-2, 2;
-3, 0, 3;
0, -4, 0, 4;
-5, 0, 0, 0, 5;
6, -6, -6, 0, 0, 6;
-7, 0, 0, 0, 0, 0, 7;
...
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MAPLE
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A125093 := proc(n, k) if n = k then n; elif n mod k = 0 then n*numtheory[mobius](n/k) ; else 0; end if; end proc:
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Offset and definition corrected by R. J. Mathar, Apr 10 2011
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STATUS
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approved
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