Search: id:A128317
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%I A128317
%S A128317 1,0,1,3,2,1,0,4,3,1,5,4,6,4,1,0,5,9,10,5,1,7,6,15,20,15,6,1,0,12,24,36,
%T A128317 35,21,7,1,9,12,30,56,70,56,28,8,1,0,9,30,80,125,126,84,36,9,1
%V A128317 1,0,1,3,-2,1,0,4,-3,1,5,-4,6,-4,1,0,5,-9,10,-5,1,7,-6,15,-20,15,-6,1,
               0,12,-24,36,-35,
%W A128317 21,-7,1,9,-12,30,-56,70,-56,28,-8,1,0,9,-30,80,-125,126,-84,36,-9,1
%N A128317 A054523 * signed A007318.
%C A128317 Row sums = phi(n), A000010: (1, 1, 2, 2, 4, 2, 6, 4, 6,...).
%F A128317 A054523 * A007318 as infinite lower triangular matrices. A007318 is signed 
               by columns: (+, -, +,...).
%e A128317 First few rows of the triangle are:
%e A128317 1;
%e A128317 0, 1;
%e A128317 3, -2, 1;
%e A128317 0, 4, -3, 1;
%e A128317 5, -4, 6, -4, 1;
%e A128317 0, 5, -9, 10, -5, 1;
%e A128317 7, -6, 15, -20, 15, -6, 1;
%e A128317 ...
%Y A128317 Cf. A054523, A007318, A000010.
%Y A128317 Sequence in context: A083721 A158459 A031251 this_sequence A084269 A051427 
               A098825
%Y A128317 Adjacent sequences: A128314 A128315 A128316 this_sequence A128318 A128319 
               A128320
%K A128317 tabl,sign
%O A128317 1,4
%A A128317 Gary W. Adamson (qntmpkt(AT)yahoo.com), Feb 25 2007

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