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 A199483 #14 Sep 08 2022 08:46:00
%S A199483 7,43,295,2059,14407,100843,705895,4941259,34588807,242121643,
%T A199483 1694851495,11863960459,83047723207,581334062443,4069338437095,
%U A199483 28485369059659,199397583417607,1395783083923243,9770481587462695,68393371112238859
%N A199483 6*7^n+1.
%H A199483 Vincenzo Librandi, <a href="/A199483/b199483.txt">Table of n, a(n) for n = 0..1000</a>
%H A199483 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (8,-7).
%F A199483 a(n) = 7*a(n-1)-6.
%F A199483 a(n) = 8*a(n-1)-7*a(n-2).
%F A199483 G.f.: (7-13*x)/((1-x)*(1-7*x)).
%t A199483 LinearRecurrence[{8,-7},{7,43},30] (* or *) NestList[7#-6&,7,30] (* _Harvey P. Dale_, Apr 13 2015 *)
%o A199483 (Magma) [6*7^n+1: n in [0..30]];
%K A199483 nonn,easy
%O A199483 0,1
%A A199483 _Vincenzo Librandi_, Nov 07 2011