A155076 Triangle read by rows. The main diagonal is positive. If rowindex >= 2*columnindex then -1 else 0.

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

Offset: 1

Author

Mats Granvik, Gary W. Adamson, Jan 19 2009

Keywords

• sign
• tabl

Comments

Matrix inverse of this triangle is A155077.

Examples

			Table begins:
1,
-1,1,
-1,0,1,
-1,-1,0,1,
-1,-1,0,0,1,
-1,-1,-1,0,0,1,
-1,-1,-1,0,0,0,1,
-1,-1,-1,-1,0,0,0,1,
-1,-1,-1,-1,0,0,0,0,1,
		

Crossrefs

Cf. A000123.