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 A010735 #26 Dec 14 2023 05:53:41
%S A010735 9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,
%T A010735 10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,9,10,
%U A010735 9,10,9,10,9,10,9,10,9,10,9,10
%N A010735 Period 2: repeat (9,10).
%C A010735 Continued fraction expansion of A176523. - _R. J. Mathar_, Mar 08 2012
%H A010735 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
%F A010735 G.f. ( -9-10*x ) / ( (x-1)*(1+x) ). - _R. J. Mathar_, Nov 21 2011
%t A010735 Table[9 + Mod[n, 2], {n, 0, 50}] (* _Jinyuan Wang_, Feb 26 2020 *)
%t A010735 PadRight[{},70,{9,10}] (* _Harvey P. Dale_, Sep 23 2021 *)
%o A010735 (PARI) a(n)=n%2+9 \\ _Charles R Greathouse IV_, Jul 13 2016
%K A010735 nonn,easy
%O A010735 0,1
%A A010735 _N. J. A. Sloane_