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 A199753 #14 Sep 08 2022 08:46:00
%S A199753 5,45,485,5325,58565,644205,7086245,77948685,857435525,9431790765,
%T A199753 103749698405,1141246682445,12553713506885,138090848575725,
%U A199753 1518999334332965,16708992677662605,183798919454288645,2021788113997175085
%N A199753 4*11^n+1.
%H A199753 Vincenzo Librandi, <a href="/A199753/b199753.txt">Table of n, a(n) for n = 0..900</a>
%H A199753 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (12,-11).
%F A199753 a(n) = 5*A083077
%F A199753 a(n) = 11*a(n-1)-10.
%F A199753 a(n) = 12*a(n-1)-11*a(n-2).
%F A199753 G.f.: 5*(1-3*x)/((1-x)*(1-11*x)).
%t A199753 4*11^Range[0,20]+1 (* or *) LinearRecurrence[{12,-11},{5,45},20] (* _Harvey P. Dale_, Mar 28 2012 *)
%o A199753 (Magma)[4*11^n+1: n in [0..30]];
%K A199753 nonn,easy
%O A199753 0,1
%A A199753 _Vincenzo Librandi_, Nov 10 2011