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 A199114 #17 Mar 20 2023 11:32:38 %S A199114 12,34,100,298,892,2674,8020,24058,72172,216514,649540,1948618, %T A199114 5845852,17537554,52612660,157837978,473513932,1420541794,4261625380, %U A199114 12784876138,38354628412,115063885234,345191655700,1035574967098,3106724901292 %N A199114 a(n) = 11*3^n+1. %H A199114 Vincenzo Librandi, <a href="/A199114/b199114.txt">Table of n, a(n) for n = 0..1000</a> %H A199114 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (4,-3). %F A199114 a(n) = 3*a(n-1)-2. %F A199114 a(n) = 4*a(n-1)-3*a(n-2). %F A199114 G.f.: 2*(6-7*x)/((1-x)*(1-3*x)). - _Bruno Berselli_, Nov 04 2011 %F A199114 a(n) = 2*A199113(n). - _R. J. Mathar_, Nov 01 2015 %o A199114 (Magma) [11*3^n+1: n in [0..30]]; %K A199114 nonn,easy %O A199114 0,1 %A A199114 _Vincenzo Librandi_, Nov 04 2011