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 A350965 #6 Mar 07 2022 13:52:38 %S A350965 2,22,218,2158,21362,211462,2093258,20721118,205117922,2030458102, %T A350965 20099463098,198964172878,1969542265682,19496458483942, %U A350965 192995042573738,1910453967253438,18911544629960642,187204992332352982,1853138378693569178 %N A350965 a(n) = sqrt(6*A138288(n)^2 - 2). %D A350965 H. Brocard, Note #2049, L'Intermédiaire des Mathématiciens, 8 (1901), pp. 212-213. %H A350965 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (10,-1). %F A350965 G.f.: 2*(1+x)/(1-10*x+x^2) . - _R. J. Mathar_, Mar 07 2022 %Y A350965 Cf. A138288. Equals 2*A054320. %K A350965 nonn,easy %O A350965 0,1 %A A350965 _N. J. A. Sloane_, Mar 02 2022