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 A136320 #16 Jul 28 2020 11:12:34 %S A136320 3,1,9,7,15,13,21,19,27,25,33,31,39,37,45,43,51,49,57,55,63,61,69,67, %T A136320 75,73,81,79,87,85,93,91,99,97,105,103,111,109,117,115,123,121,129, %U A136320 127,135,133,141,139,147,145,153,151,159,157,165,163,171,169,177,175,183 %N A136320 Terms of A047241 swapped in pairs. %H A136320 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (1,1,-1). %F A136320 a(n) = 6*n - a(n-1) - 2 (with a(0)=3). - _Vincenzo Librandi_, Nov 24 2010 %F A136320 From _Chai Wah Wu_, Jul 28 2020: (Start) %F A136320 a(n) = a(n-1) + a(n-2) - a(n-3) for n > 2. %F A136320 G.f.: (5*x^2 - 2*x + 3)/((x - 1)^2*(x + 1)). (End) %K A136320 nonn,easy %O A136320 0,1 %A A136320 _Paul Curtz_, Mar 25 2008