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A155076 Triangle read by rows. The main diagonal is positive. If rowindex >= 2*columnindex then -1 else 0. 1
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 (list; table; graph; refs; listen; history; text; internal format)
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: A051731 A135839 A071022 * A257196 A176137 A120529

Adjacent sequences:  A155073 A155074 A155075 * A155077 A155078 A155079

KEYWORD

sign,tabl,changed

AUTHOR

Mats Granvik, Gary W. Adamson, Jan 19 2009

STATUS

approved

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Last modified May 26 14:08 EDT 2018. Contains 304608 sequences. (Running on oeis4.)