A078047 - OEIS

%I #12 Apr 07 2020 03:36:59

%S 1,-2,1,-1,4,-5,3,-6,13,-13,12,-25,39,-38,49,-89,116,-125,187,-294,

%T 357,-437,668,-945,1151,-1542,2281,-3041,3844,-5365,7603,-9926,13053,

%U -18333,25132,-32905,44439,-61798,83169,-110249,150676,-206765,276587,-371174,508117,-690117,924348,-1250465

%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).

%o (PARI) Vec((1-x)/(1+x+x^2+2*x^3) + O(x^50)) \\ _Jinyuan Wang_, Apr 07 2020

%Y First differences of A077976.

%K sign,easy

%O 0,2

%A _N. J. A. Sloane_, Nov 17 2002