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%I #13 Aug 08 2019 18:58:33
%S 1,-2,3,-3,2,1,-5,10,-13,13,-6,-7,27,-46,59,-51,18,49,-133,218,-253,
%T 205,-22,-279,667,-990,1099,-755,-126,1569,-3205,4522,-4589,2701,1754,
%U -8231,15387,-20110,19035,-8371,-12814,42513,-72069,88954,-75997,20813,81098,-212279,335003,-385086,295531
%N Expansion of (1-x)/(1+x-x^2-2*x^3).
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (-1,1,2).
%t CoefficientList[Series[(1-x)/(1+x-x^2-2x^3),{x,0,60}],x] (* or *) LinearRecurrence[{-1,1,2},{1,-2,3},60] (* _Harvey P. Dale_, Dec 03 2018 *)
%Y First differences of A077971.
%K sign,easy
%O 0,2
%A _N. J. A. Sloane_, Nov 17 2002