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A127448
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Triangle T(n,k) read by rows: matrix product A054525 * A127648.
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3
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1, -1, 2, -1, 0, 3, 0, -2, 0, 4, -1, 0, 0, 0, 5, 1, -2, -3, 0, 0, 6, -1, 0, 0, 0, 0, 0, 7, 0, 0, 0, -4, 0, 0, 0, 8, 0, 0, -3, 0, 0, 0, 0, 0, 9, 1, -2, 0, 0, -5, 0, 0, 0, 0, 10, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 2, 0, -4, 0, -6, 0, 0, 0, 0, 0, 12, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 1, -2, 0, 0, 0, 0, -7, 0, 0, 0, 0, 0, 0
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OFFSET
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1,3
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LINKS
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FORMULA
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sum_{k=1..n} T(n,k) = A000010(n) (row sums).
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EXAMPLE
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First few rows of the triangle are;
1;
-1, 2;
-1, 0, 3;
0, -2, 0, 4;
-1, 0, 0, 0, 5;
1, -2, -3, 0, 0, 6;
-1, 0, 0, 0, 0, 0, 7;
0, 0, 0, -4, 0, 0, 0, 8;
0, 0, -3, 0, 0, 0, 0, 0, 9;
1, -2, 0, 0,-5, 0, 0, 0, 0, 10;
...
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MAPLE
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A127648 := proc(n, k) if n = k then n; else 0 ; fi; end:
A054525 := proc(n, k) if k = n then 1; elif n mod k = 0 then numtheory[mobius](n/k) ; else 0 ; fi; end:
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Converted comments to formulas, extended - R. J. Mathar, Sep 11 2009
Corrected A-number typo in a formula - R. J. Mathar, Sep 17 2009
Corrected last example line by John Mason, Jan 07 2015
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STATUS
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approved
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