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 A175672 #23 Sep 08 2022 08:45:51
%S A175672 0,24,6096,1548360,393277344,99890897016,25371894564720,
%T A175672 6444361328541864,1636842405555068736,415751526649658917080,
%U A175672 105599250926607809869584,26821793983831734047957256
%N A175672 y-values in the solution to x^2 - 28*y^2=1.
%C A175672 The corresponding values of x of this Pell equation are in A175633.
%H A175672 Vincenzo Librandi, <a href="/A175672/b175672.txt">Table of n, a(n) for n = 1..200</a>
%H A175672 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (254,-1).
%F A175672 a(n) = 254*a(n-1)-a(n-2) with a(1)=0, a(2)=24.
%F A175672 G.f.: 24*x^2/(1-254*x+x^2).
%t A175672 LinearRecurrence[{254,-1},{0,24},20]
%o A175672 (Magma) I:=[0,24]; [n le 2 select I[n] else 254*Self(n-1)-Self(n-2): n in [1..15]];
%Y A175672 Cf. A175633.
%K A175672 nonn,easy,less
%O A175672 1,2
%A A175672 _Vincenzo Librandi_, Dec 04 2010