A142971 - OEIS

%I #6 Jul 03 2016 00:15:25

%S 0,-2,0,-3,0,0,0,-2,0,0,-5,0,0,0,0,0,-3,-2,0,0,0,-7,0,0,0,0,0,0,0,0,0,

%T -2,0,0,0,0,0,0,-3,0,0,0,0,0,0,0,-5,0,0,-2,0,0,0,0,0,-11,0,0,0,0,0,0,

%U 0,0,0,0,0,0,0,-3,0,-2,0,0,0,0,0,0,-13,0,0,0,0,0,0,0,0,0,0,0,0,0,-7,0,0,0,0,-2,0,0,0,0,0,0,0,0,0,-5,0,-3,0,0,0,0,0,0,0

%N Triangle read by rows: A061397 with negative signs interleaved with (k-1) zeros.

%C Except for the first term, row products are given by A062953.

%e Table begins:

%e 0;

%e -2, 0;

%e -3, 0, 0;

%e 0,-2, 0, 0;

%e -5, 0, 0, 0, 0;

%e 0,-3,-2, 0, 0, 0;

%e -7, 0, 0, 0, 0, 0, 0;

%e 0, 0, 0,-2, 0, 0, 0, 0;

%e 0, 0,-3, 0, 0, 0, 0, 0, 0;

%o (Excel) =if(mod(row();column())=0;lookup(row()/column();A000027;-A061397);"")

%Y Cf. A061397, A062953, A008472.

%K sign,tabl

%O 1,2

%A Mats O. Granvik and _Gary W. Adamson_, Jul 14 2008