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 A041199 #21 Jul 09 2025 00:25:26
%S A041199 1,2,41,84,1721,3526,72241,148008,3032401,6212810,127288601,260790012,
%T A041199 5343088841,10946967694,224282442721,459511853136,9414519505441,
%U A041199 19288550864018,395185536785801,809659624435620,16588378025498201,33986415675432022
%N A041199 Denominators of continued fraction convergents to sqrt(110).
%H A041199 Vincenzo Librandi, <a href="/A041199/b041199.txt">Table of n, a(n) for n = 0..200</a>
%H A041199 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,42,0,-1).
%F A041199 G.f.: -(x^2-2*x-1) / (x^4-42*x^2+1). - _Colin Barker_, Nov 14 2013
%t A041199 Denominator[Convergents[Sqrt[110],30]] (* _Harvey P. Dale_, Oct 10 2012 *)
%t A041199 CoefficientList[Series[(1 + 2 x - x^2)/(1 - 42 x^2 + x^4), {x, 0, 30}], x] (* _Vincenzo Librandi_, Dec 12 2013*)
%Y A041199 Cf. A041198, A176221, A040099.
%K A041199 nonn,frac,easy
%O A041199 0,2
%A A041199 _N. J. A. Sloane_
%E A041199 More terms from _Colin Barker_, Nov 14 2013