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 A132644 #18 Jan 02 2024 08:53:46
%S A132644 0,324,421200,546717924,709639444800,921111452633124,
%T A132644 1195601955878350800,1551890417618646705924,2014352566467047545939200,
%U A132644 2614628079383810095982376324,3393785232687619037537578530000
%N A132644 X-values of solutions to the equation X*(X + 1) - 13*Y^2 = 0.
%H A132644 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (1299,-1299,1).
%F A132644 a(n) = 1298*a(n-1) - a(n-2) + 648; a(0)=0, a(1)=324.
%F A132644 G.f.: -324*x*(x+1)/((x-1)*(x^2 - 1298*x + 1)). - _Colin Barker_, Oct 25 2012
%t A132644 CoefficientList[Series[-((324 x (1+x))/(-1+1299 x-1299 x^2+x^3)),{x,0,20}],x] (* or *) LinearRecurrence[{1299,-1299,1},{0,324,421200},20] (* _Harvey P. Dale_, Jul 24 2021 *)
%Y A132644 Cf. A007654.
%K A132644 nonn,easy
%O A132644 0,2
%A A132644 _Mohamed Bouhamida_, Nov 14 2007
%E A132644 More terms from _Paolo P. Lava_, Oct 07 2008