%I #17 May 19 2019 11:34:24
%S 1,2,3,74,77,228,11477,23182,34659,854998,889657,2634312,132605257,
%T 267844826,400450083,9878646818,10279096901,30436840620,1532121127901,
%U 3094679096422,4626800224323,114137884480174,118764684704497,351667253889168,17702127379162897
%N Denominators of continued fraction convergents to sqrt(642).
%H Vincenzo Librandi, <a href="/A042233/b042233.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 (0,0,0,0,0,11554,0,0,0,0,0,-1).
%F G.f.: -(x^10 - 2*x^9 + 3*x^8 - 74*x^7 + 77*x^6 - 228*x^5 - 77*x^4 - 74*x^3 - 3*x^2 - 2*x - 1) / (x^12 - 11554*x^6 + 1). - _Colin Barker_, Dec 05 2013
%t Denominator[Convergents[Sqrt[642], 30]] (* _Vincenzo Librandi_, Jan 17 2014 *)
%Y Cf. A042232, A040616.
%K nonn,frac,easy
%O 0,2
%A _N. J. A. Sloane_
%E More terms from _Colin Barker_, Dec 05 2013