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 A253212 #9 Sep 08 2022 08:46:10
%S A253212 9,17,89,737,6569,59057,531449,4782977,43046729,387420497,3486784409,
%T A253212 31381059617,282429536489,2541865828337,22876792454969,
%U A253212 205891132094657,1853020188851849,16677181699666577,150094635296999129,1350851717672992097,12157665459056928809
%N A253212 a(n) = 9^n + 8.
%C A253212 Subsequence of A226832.
%H A253212 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (10,-9).
%F A253212 G.f.: (9 - 73*x)/((1 - x)*(1 - 9*x)).
%F A253212 a(n) = 10*a(n-1) - 9*a(n-2) for n>1.
%t A253212 Table[9^n + 8, {n, 0, 40}]
%t A253212 LinearRecurrence[{10,-9},{9,17},30] (* _Harvey P. Dale_, Jul 02 2021 *)
%o A253212 (Magma) [9^n+8: n in [0..30]];
%Y A253212 Cf. similar sequences listed in A253208.
%Y A253212 Cf. A177095, A226832.
%K A253212 nonn,easy
%O A253212 0,1
%A A253212 _Vincenzo Librandi_, Dec 30 2014