%I A078040
%S A078040 1,2,4,10,22,50,114,258,586,1330,3018,6850,15546,35282,80074,181730,412442,
%T A078040 936050,2124394,4821378,10942266,24833810,56361098,127913250,290303066,
%U A078040 658851762,1495284394,3393594050,7701866362,17479623250,39670544074,90033523298
%V A078040 1,-2,4,-10,22,-50,114,-258,586,-1330,3018,-6850,15546,-35282,80074,-181730,
               412442,
%W A078040 -936050,2124394,-4821378,10942266,-24833810,56361098,-127913250,290303066,
%X A078040 -658851762,1495284394,-3393594050,7701866362,-17479623250,39670544074,
               -90033523298
%N A078040 Expansion of (1-x)/(1+x-2*x^2+2*x^3).
%Y A078040 First differences of A077970.
%Y A078040 Sequence in context: A018108 A033497 A075560 this_sequence A164990 A121285 
               A030234
%Y A078040 Adjacent sequences: A078037 A078038 A078039 this_sequence A078041 A078042 
               A078043
%K A078040 sign
%O A078040 0,2
%A A078040 N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002