This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A077888 #7 Sep 01 2022 13:37:24
%S A077888 1,1,0,1,2,0,0,3,1,-2,3,4,-4,0,9,-3,-8,13,6,-20,8,27,-27,-18,55,-8,
%T A077888 -72,64,65,-135,0,201,-134,-200,336,67,-535,270,603,-804,-332,1408,
%U A077888 -471,-1739,1880,1269,-3618,612,4888,-4229,-4275,9118,47,-13392,9072,13440,-22463,-4367,35904,-18095,-40270
%N A077888 Expansion of (1-x)^(-1)/(1+x^2-x^3).
%H A077888 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (1,-1,2,-1).
%t A077888 CoefficientList[Series[(1-x)^(-1)/(1+x^2-x^3),{x,0,60}],x] (* or *) LinearRecurrence[ {1,-1,2,-1},{1,1,0,1},70] (* _Harvey P. Dale_, Sep 01 2022 *)
%K A077888 sign,easy
%O A077888 0,5
%A A077888 _N. J. A. Sloane_, Nov 17 2002