%I #20 Sep 08 2022 08:44:55
%S 1,3,181,546,32941,99369,5995081,18084612,1091071801,3291300015,
%T 198569072701,598998518118,36138480159781,109014438997461,
%U 6577004820007441,19840028899019784,1196978738761194481,3610776245182603227,217843553449717388101,657141436594334767530
%N Denominators of continued fraction convergents to sqrt(920).
%H Vincenzo Librandi, <a href="/A042779/b042779.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 (0,182,0,-1).
%F G.f.: -(x^2-3*x-1) / (x^4-182*x^2+1). - _Colin Barker_, Dec 23 2013
%F a(n) = 182*a(n-2) - a(n-4) for n>3. - _Vincenzo Librandi_, Jan 29 2014
%t Denominator[Convergents[Sqrt[920], 30]] (* _Harvey P. Dale_, May 03 2012 *)
%o (Magma) I:=[1,3,181,546]; [n le 4 select I[n] else 182*Self(n-2)-Self(n-4): n in [1..30]]; // _Vincenzo Librandi_, Jan 29 2014
%Y Cf. A042778, A040889.
%K nonn,frac,easy
%O 0,2
%A _N. J. A. Sloane_.
%E More terms from _Colin Barker_, Dec 23 2013