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 A127444 Triangle defined as the matrix product A051731*A127442, read by rows. 0

%I

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

%T -6,0,2,-1,2,-2,1,3,-4,0,1,-1,2,-2,1,0,4,-6,0,2,-2,2,-2,1,0,1,2,-2,0,

%U 1,-1,2,-2,1,0,1,-2,6,-10,0,3,-2,4,-2,1

%N Triangle defined as the matrix product A051731*A127442, read by rows.

%C Row sums = 0.

%F T(n,k) = sum_{j=k..n} A051731(n,j)*A127442(j,k) = sum_{j=k..n, j|n} A127442(j,k), 1<=k<=n.

%e First few rows of the triangle are:

%e 1;

%e 2, -2;

%e 2, -2, 0;

%e 3, -4, 0, 1;

%e 2, -2, 0, 1, -1;

%e 4, -6, 0, 1, -1, 2;

%e 2, -2, 0, 1, -1, 2, -2;

%e ...

%Y Cf. A000005 (column k=1), A051731, A127442.

%K tabl,easy,sign

%O 1,2

%A _Gary W. Adamson_, Jan 14 2007

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Last modified June 19 20:27 EDT 2021. Contains 345145 sequences. (Running on oeis4.)