Search: id:A118402
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%I A118402
%S A118402 1,1,3,1,5,1,7,3,9,5,11,7,13,9,15,11,17,13,19,15,21,17,23,19,25,21,27,
%T A118402 23,29,25,31,27,33,29,35,31,37,33,39,35,41,37,43,39,45,41,47,43,49,45,
%U A118402 51,47,53,49,55,51,57,53,59,55,61,57,63,59,65,61,67,63,69,65,71
%V A118402 1,1,3,1,5,-1,7,-3,9,-5,11,-7,13,-9,15,-11,17,-13,19,-15,21,-17,23,-19,
               25,-21,27,-23,
%W A118402 29,-25,31,-27,33,-29,35,-31,37,-33,39,-35,41,-37,43,-39,45,-41,47,-43,
               49,-45,51,-47,
%X A118402 53,-49,55,-51,57,-53,59,-55,61,-57,63,-59,65,-61,67,-63,69,-65,71
%N A118402 Row sums of triangle A118401.
%F A118402 G.f.: A(x) = (1+2*x+2*x^2)*(1+x^2)/(1+x)^2/(1-x). a(n^2-n+2) = A118403(n).
%o A118402 (PARI) {a(n)=polcoeff((1+2*x+2*x^2)*(1+x^2)/(1+x+x*O(x^n))^2/(1-x),n,
               x)}
%Y A118402 Cf. A118401, A118403.
%Y A118402 Sequence in context: A093178 A093411 A147088 this_sequence A122383 A136180 
               A095112
%Y A118402 Adjacent sequences: A118399 A118400 A118401 this_sequence A118403 A118404 
               A118405
%K A118402 sign
%O A118402 0,3
%A A118402 Paul D. Hanna (pauldhanna(AT)juno.com), Apr 27 2006

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