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

%I

%S 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,

%T -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,

%U -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

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

%C Matrix inverse of this triangle is A155077.

%e Table begins:

%e 1,

%e -1,1,

%e -1,0,1,

%e -1,-1,0,1,

%e -1,-1,0,0,1,

%e -1,-1,-1,0,0,1,

%e -1,-1,-1,0,0,0,1,

%e -1,-1,-1,-1,0,0,0,1,

%e -1,-1,-1,-1,0,0,0,0,1,

%Y Cf. A000123.

%K sign,tabl

%O 1,1

%A _Mats Granvik_, _Gary W. Adamson_, Jan 19 2009

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Last modified May 26 17:17 EDT 2019. Contains 323597 sequences. (Running on oeis4.)