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Triangle T(n,k) = k*mobius(n).
2

%I #6 Sep 08 2013 18:32:40

%S 1,-1,-2,-1,-2,-3,0,0,0,0,-1,-2,-3,-4,-5,1,2,3,4,5,6,-1,-2,-3,-4,-5,

%T -6,-7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10

%N Triangle T(n,k) = k*mobius(n).

%F T(n,k) = A008683(n)*k.

%e First few rows of the triangle are:

%e 1;

%e -1, -2;

%e -1, -2, -3;

%e 0, 0, 0, 0;

%e -1, -2, -3, -4, -5;

%e 1, 2, 3, 4, 5, 6;

%e ...

%p A127510 := proc(n,k)

%p numtheory[mobius](n)*k ;

%p end proc: # _R. J. Mathar_, Sep 08 2013

%Y Cf. A008683, A000217, A125287 (row sums).

%K tabl,easy,sign

%O 1,3

%A _Gary W. Adamson_, Jan 17 2007