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 A350967 #6 Mar 07 2022 14:22:21 %S A350967 9,999,109881,12085911,1329340329,146215350279,16082359190361, %T A350967 1768913295589431,194564380155647049,21400312903825585959, %U A350967 2353839855040658808441,258900983741568643342551,28476754371717510108872169,3132184079905184543332596039,344511772035198582256476692121 %N A350967 a(n) = sqrt(84*A144930(n)^2 - 3). %D A350967 E.-A. Majol, Note #2228, L'Intermédiaire des Mathématiciens, 9 (1902), pp. 183-185. %H A350967 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (110,-1). %F A350967 G.f.: 9*x*(1+x)/(1-110*x+x^2) . - _R. J. Mathar_, Mar 07 2022 %F A350967 a(n) = 9*A298677(n-1). - _R. J. Mathar_, Mar 07 2022 %Y A350967 Cf. A144930. %K A350967 nonn %O A350967 1,1 %A A350967 _N. J. A. Sloane_, Mar 03 2022