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 A253209 #39 Feb 06 2024 11:59:42
%S A253209 6,11,41,221,1301,7781,46661,279941,1679621,10077701,60466181,
%T A253209 362797061,2176782341,13060694021,78364164101,470184984581,
%U A253209 2821109907461,16926659444741,101559956668421,609359740010501,3656158440062981,21936950640377861,131621703842267141
%N A253209 a(n) = 6^n + 5.
%C A253209 Subsequence of A226814.
%H A253209 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (7,-6).
%F A253209 G.f.: (6 - 31*x) / ((1 - x)*(1 - 6*x)).
%F A253209 a(n) = 7*a(n-1) - 6*a(n-2) for n>1.
%t A253209 Table[6^n + 5, {n, 0, 30}]
%o A253209 (Magma) [6^n+5: n in [0..30]];
%Y A253209 Cf. similar sequences listed in A253208.
%Y A253209 Cf. A164784, A226814.
%K A253209 nonn,easy
%O A253209 0,1
%A A253209 _Vincenzo Librandi_, Dec 29 2014