%I A110168
%S A110168 1,3,1,7,6,1,18,24,9,1,47,84,50,12,1,123,275,225,85,15,1,322,864,900,468,
%T A110168 129,18,1,843,2639,3339,2219,840,182,21,1,2207,7896,11756,9528,4610,1368,
               244,
%U A110168 24,1,5778,23256,39825,38121,22518,8532,2079,315,27,1,15127,67650,130975
%V A110168 1,-3,1,7,-6,1,-18,24,-9,1,47,-84,50,-12,1,-123,275,-225,85,-15,1,322,
               -864,900,-468,
%W A110168 129,-18,1,-843,2639,-3339,2219,-840,182,-21,1,2207,-7896,11756,-9528,
               4610,-1368,244,
%X A110168 -24,1,-5778,23256,-39825,38121,-22518,8532,-2079,315,-27,1,15127,-67650,
               130975
%N A110168 Riordan array ((1-x^2)/(1+3x+x^2),x/(1+3x+x^2)).
%C A110168 Inverse of A110165. Row sums are 1,-2,2,-2,... with g.f. (1-x)/(1+x). 
               Diagonal sums are (-1)^n*A080923. Product of A110162 and inverse 
               binomial transform (1/(1+x),x/(1+x)).
%e A110168 Rows begin
%e A110168 1;
%e A110168 -3,1;
%e A110168 7,-6,1;
%e A110168 -18,24,-9,1;
%e A110168 47,-84,50,-12,1;
%e A110168 -123,275,-225,85,-15,1;
%Y A110168 Sequence in context: A110441 A111806 A054458 this_sequence A046913 A118228 
               A082053
%Y A110168 Adjacent sequences: A110165 A110166 A110167 this_sequence A110169 A110170 
               A110171
%K A110168 easy,sign,tabl
%O A110168 0,2
%A A110168 Paul Barry (pbarry(AT)wit.ie), Jul 14 2005