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 A199554 #14 Jul 14 2024 16:58:35
%S A199554 7,49,385,3073,24577,196609,1572865,12582913,100663297,805306369,
%T A199554 6442450945,51539607553,412316860417,3298534883329,26388279066625,
%U A199554 211106232532993,1688849860263937,13510798882111489,108086391056891905
%N A199554 6*8^n+1.
%H A199554 Vincenzo Librandi, <a href="/A199554/b199554.txt">Table of n, a(n) for n = 0..1000</a>
%H A199554 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (9,-8).
%F A199554 a(n) = 7*A083068(n).
%F A199554 a(n) = 8*a(n-1)-7.
%F A199554 a(n) = 9*a(n-1)-8*a(n-2).
%F A199554 G.f.: 7*(1-2*x)/((1-x)*(1-8*x)).
%t A199554 6*8^Range[0,20]+1 (* or *) LinearRecurrence[{9,-8},{7,49},20] (* or *) NestList[8#-7&,7,20] (* _Harvey P. Dale_, Jul 14 2024 *)
%o A199554 (Magma) [6*8^n+1: n in [0..30]];
%K A199554 nonn,easy
%O A199554 0,1
%A A199554 _Vincenzo Librandi_, Nov 08 2011