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 A041049 #35 Aug 11 2024 09:55:13
%S A041049 1,2,21,44,461,966,10121,21208,222201,465610,4878301,10222212,
%T A041049 107100421,224423054,2351330961,4927084976,51622180721,108171446418,
%U A041049 1133336644901,2374844736220,24881784007101
%N A041049 Denominators of continued fraction convergents to sqrt(30).
%H A041049 Vincenzo Librandi, <a href="/A041049/b041049.txt">Table of n, a(n) for n = 0..200</a>
%H A041049 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,22,0,-1).
%F A041049 G.f.: (1+2*x-x^2)/(1-22*x^2+x^4). [_Colin Barker_, Jan 02 2012]
%t A041049 Table[Denominator[FromContinuedFraction[ContinuedFraction[Sqrt[30], n]]],{n, 1, 50}] (* _Vladimir Joseph Stephan Orlovsky_, Mar 18 2011 *)
%t A041049 Denominator[Convergents[Sqrt[30], 20]] (* _Vincenzo Librandi_, Oct 23 2013 *)
%Y A041049 Cf. A010485, A040024, A041048 (numerators).
%K A041049 nonn,cofr,frac,easy
%O A041049 0,2
%A A041049 _N. J. A. Sloane_