A174190 Triangle T(n,m) = numerator of 1/n^2-1/(n-m)^2, read by rows.

0, 0, -3, 0, -5, -8, 0, -7, -3, -15, 0, -9, -16, -21, -24, 0, -11, -5, -1, -2, -35, 0, -13, -24, -33, -40, -45, -48, 0, -15, -7, -39, -3, -55, -15, -63, 0, -17, -32, -5, -56, -65, -8, -77, -80, 0, -19, -9, -51, -4, -3, -21, -91, -6, -99, 0, -21, -40, -57, -72, -85, -96

Offset: 1

Author

Paul Curtz, Mar 11 2010

Keywords

• sign
• easy
• tabl

Comments

The triangle contains the initial values of the array described in A172370.

Ignoring details of column indexing, these are the negated values of A061035.

Examples

			The triangle starts in column n=1, rows 0<=m<n as
0;
0,-3;
0,-5,-8;
0,-7,-3,-15;
0,-9,-16,-21,-24;
		

Extensions

Comments compactified with reference to A172370, formula and example added - R. J. Mathar, Nov 23 2010