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%I #6 May 29 2023 11:26:46
%S 1,1,1,2,-1,2,2,0,0,2,4,-1,-1,-1,4,2,0,2,-1,1,2,6,-1,-1,-1,-1,-1,6,4,
%T 0,0,0,0,0,0,4,6,-3,3,0,0,-3,0,0,6,4,2,-1,-3,4,-1,1,-1,1,4,10,-1,-1,
%U -1,-1,-1,-1,-1,-1,-1,10,4,-4,4,2,2,0,0,-2,0,2,0,4
%N Triangle read by rows, A126988 * A054533
%C Row sums = n, right and left borders = A000012, phi(n).
%F Triangle read by rows, A126988 * A054533, where A054533 = the lower half of the Ramanujan sum table.
%e First few rows of the triangle =
%e 1;
%e 1,...1;
%e 2,..-1,...2;
%e 2,...0,...0,...2;
%e 4,..-1,..-1,..-1,...4;
%e 2,...0,...2,..-1,...1,...2;
%e 6,..-1,..-1,..-1,..-1,..-1,...6;
%e 4,...0,...0,...0,...0,...0,...0,...4;
%e 6,..-3,...3,...0,...0,..-3,...0,...0,...6;
%e 4,...2,..-1,..-3,...4,..-1,...1,..-1,...1,...4;
%e 10,.-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,...10;
%e 4,..-4,...4,...2,...2,...0,...0,..-2,...0,...2,....0,...4;
%e 12,.-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,...-1,..-1,...12;
%e 6,...4,..-1,..-3,..-1,..-3,...6,..-1,...1,..-1,....1,...1,....1,...6;
%e 8,..-7,...5,..-2,...8,..-2,...1,...1,..-2,..-4,....1,..-2,....1,...1,...8;
%e 8,...0,...0,...0,...0,...0,...0,...0,...0,...0,....0,...0,....0,...0,...0,...8;
%e ...
%Y Cf. A054533, A126988.
%K tabl,sign
%O 1,4
%A _Gary W. Adamson_, Apr 25 2009
%E a(29) split and more terms from _Georg Fischer_, May 29 2023
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