%I #15 Apr 14 2021 19:27:20
%S 1,2,9,20,889,1798,8081,17960,798321,1614602,7256729,16128060,
%T 716891369,1449910798,6516534561,14482979920,643767651041,
%U 1302018282002,5851840779049,13005699840100,578102633743449,1169210967326998,5254946503051441,11679103973429880
%N Denominators of continued fraction convergents to sqrt(504).
%H Vincenzo Librandi, <a href="/A041963/b041963.txt">Table of n, a(n) for n = 0..200</a>
%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,898,0,0,0,-1).
%F G.f.: -(x^2-2*x-1)*(x^4+10*x^2+1) / ((x^4-30*x^2+1)*(x^4+30*x^2+1)). - _Colin Barker_, Nov 28 2013
%t Denominator[Convergents[Sqrt[504], 30]] (* _Vincenzo Librandi_, Dec 28 2013 *)
%t LinearRecurrence[{0,0,0,898,0,0,0,-1},{1,2,9,20,889,1798,8081,17960},40] (* _Harvey P. Dale_, Apr 14 2021 *)
%Y Cf. A041962, A040481.
%K nonn,frac,easy
%O 0,2
%A _N. J. A. Sloane_.
%E More terms from _Colin Barker_, Nov 28 2013