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 A042150 #18 Jul 09 2025 02:20:09
%S A042150 24,49,2376,4801,232824,470449,22814376,46099201,2235576024,
%T A042150 4517251249,219063635976,442644523201,21466000749624,43374646022449,
%U A042150 2103449009827176,4250272665676801,206116536962313624,416483346590304049
%N A042150 Numerators of continued fraction convergents to sqrt(600).
%H A042150 Vincenzo Librandi, <a href="/A042150/b042150.txt">Table of n, a(n) for n = 0..200</a>
%H A042150 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (0,98,0,-1).
%F A042150 G.f.: (1 + x)*(24 + 25*x - x^2)/((1 - 10*x + x^2)*(1 + 10*x + x^2)). - _Vincenzo Librandi_, Nov 18 2013
%F A042150 a(n) = 98*a(n-2) - a(n-4). - _Vincenzo Librandi_, Nov 18 2013
%t A042150 Numerator[Convergents[Sqrt[600], 30]] (* or *) CoefficientList[Series[(24 + 49 x + 24 x^2 - x^3)/(1 - 98 x^2 + x^4), {x, 0, 30}], x] (* _Vincenzo Librandi_, Nov 18 2013 *)
%o A042150 (Magma) I:=[24,49,2376,4801]; [n le 4 select I[n] else 98*Self(n-2)-Self(n-4): n in [1..30]]; // _Vincenzo Librandi_, Nov 18 2013
%Y A042150 Cf. A042151.
%K A042150 nonn,cofr,frac,easy,less
%O A042150 0,1
%A A042150 _N. J. A. Sloane_