A128432 Triangle read by rows: A128407 * A054521.

1, -1, 0, -1, -1, 0, 0, 0, 0, 0, -1, -1, -1, -1, 0, 1, 0, 0, 0, 1, 0, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0

Offset: 1

Author

Gary W. Adamson, Mar 03 2007

Keywords

• tabl
• sign

Comments

Row sums = A023900: (1, -1, -2, 0, -4, 2, -6, ...) Left border = mu(n), A008683.

Examples

			First few rows of the triangle:
   1;
  -1,  0;
  -1, -1,  0;
   0,  0,  0,  0;
  -1, -1, -1, -1,  0;
   1,  0,  0,  0,  1,  0;
  -1, -1, -1, -1, -1, -1,  0;
   0,  0,  0,  0,  0,  0,  0,  0;
  ...
		

Crossrefs

Cf. A128407, A054521, A008683, A023900.

Formula

A128407 * A054521 as infinite lower triangular matrices.