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

1,1

Comments

Matrix inverse of this triangle is A155077.

Links

Table of n, a(n) for n=1..85.

Example

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.

Sequence in context: A304569 A135839 A071022 * A328308 A257196 A176137

Adjacent sequences: A155073 A155074 A155075 * A155077 A155078 A155079

Keyword

sign,tabl

Author

Mats Granvik, Gary W. Adamson, Jan 19 2009

Status

approved