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 A199320 #10 Sep 08 2022 08:46:00 %S A199320 6,31,181,1081,6481,38881,233281,1399681,8398081,50388481,302330881, %T A199320 1813985281,10883911681,65303470081,391820820481,2350924922881, %U A199320 14105549537281,84633297223681,507799783342081,3046798700052481,18280792200314881 %N A199320 5*6^n+1. %H A199320 Vincenzo Librandi, <a href="/A199320/b199320.txt">Table of n, a(n) for n = 0..1000</a> %H A199320 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (7,-6). %F A199320 a(n) = 6*a(n-1)-5. %F A199320 a(n) = 7*a(n-1)-6*a(n-2). %F A199320 G.f.: (6-11*x)/((1-x)*(1-6*x)). %o A199320 (Magma) [5*6^n+1: n in [0..30]]; %K A199320 nonn,easy %O A199320 0,1 %A A199320 _Vincenzo Librandi_, Nov 06 2011