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 A350980 #18 Jan 03 2023 05:50:39 %S A350980 17,4700,1194161,303312572,77040199505,19567907362076, %T A350980 4970171429768177,1262403975253755260,320645639543024068241, %U A350980 81442730039952859578332,20686132784508483308828465,5254196284535114807582852156,1334545170139134652642735619537,338969219019055666656447264510620 %N A350980 a(0) = 17, a(1) = 4700, thereafter a(n) = 254*a(n-1) - a(n-2) + 378. %C A350980 Arises in studying the equation x^3 - 7*y^2 = 1. %D A350980 P.-F. Teilhet, Query 2228, L'Intermédiaire des Mathématiciens, 11 (1904), 44-45. %H A350980 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (255,-255,1). %F A350980 From _Chai Wah Wu_, Mar 07 2022: (Start) %F A350980 a(n) = 255*a(n-1) - 255*a(n-2) + a(n-3) for n > 3. %F A350980 G.f.: (4*x^2 - 365*x - 17)/((x - 1)*(x^2 - 254*x + 1)). (End) %Y A350980 Cf. A350979, A350981. %K A350980 nonn,easy %O A350980 0,1 %A A350980 _N. J. A. Sloane_, Mar 06 2022