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 A199677 #15 Sep 08 2022 08:46:00
%S A199677 9,73,649,5833,52489,472393,4251529,38263753,344373769,3099363913,
%T A199677 27894275209,251048476873,2259436291849,20334926626633,
%U A199677 183014339639689,1647129056757193,14824161510814729,133417453597332553,1200757082375992969
%N A199677 8*9^n+1.
%H A199677 Vincenzo Librandi, <a href="/A199677/b199677.txt">Table of n, a(n) for n = 0..1000</a>
%H A199677 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (10,-9).
%F A199677 a(n) = 9*a(n-1)-8.
%F A199677 a(n) = 10*a(n-1)-9*a(n-2).
%F A199677 G.f.: (9-17*x)/((1-x)*(1-9*x)).
%t A199677 8*9^Range[0,20]+1 (* or *) LinearRecurrence[{10,-9},{9,73},20] (* _Harvey P. Dale_, Nov 07 2013 *)
%o A199677 (Magma) [8*9^n+1: n in [0..30]];
%K A199677 nonn,easy
%O A199677 0,1
%A A199677 _Vincenzo Librandi_, Nov 09 2011