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 A158552 #9 Oct 21 2020 22:37:54 %S A158552 5,-1,7,-3,9,-5,11,-7,13,-9,15,-11,17,-13,19,-15,21,-17,23,-19,25,-21, %T A158552 27,-23,29,-25,31,-27,33,-29,35,-31,37,-33,39,-35,41,-37,43,-39,45, %U A158552 -41,47,-43,49,-45,51,-47,53,-49,55,-51,57,-53,59,-55,61,-57,63,-59,65,-61,67 %N A158552 a(n) = A144433(n) - A106833(n). %H A158552 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (-1,1,1). %F A158552 a(n) = A118402(n+3). %F A158552 From _R. J. Mathar_, Apr 08 2009: (Start) %F A158552 G.f.: x*(5+4*x+x^2)/((1-x)*(1+x)^2). %F A158552 a(n) = -a(n-1) + a(n-2) + a(n-3). %F A158552 (End) %Y A158552 Cf. A118402, A106833, A144433. %K A158552 sign %O A158552 1,1 %A A158552 _Paul Curtz_, Mar 21 2009 %E A158552 Edited and extended by _R. J. Mathar_, Apr 08 2009