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 A010715 #26 Dec 14 2023 06:04:38
%S A010715 4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,
%T A010715 10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,4,10,
%U A010715 4,10,4,10,4,10,4,10,4,10,4,10
%N A010715 Period 2: repeat (4,10).
%C A010715 Continued fraction of 2 + sqrt(110)/5 = A176220. - _R. J. Mathar_, Nov 21 2011
%H A010715 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1)
%F A010715 a(n) = -3*(-1)^n + 7. - _Paolo P. Lava_, Oct 20 2006
%F A010715 G.f. ( -4-10*x ) / ((x-1)*(1+x)). - _R. J. Mathar_, Nov 21 2011
%t A010715 Table[4 + 6 Mod[n, 2], {n, 0, 50}] (* _Jinyuan Wang_, Feb 26 2020 *)
%t A010715 PadRight[{},80,{4,10}] (* _Harvey P. Dale_, Jul 12 2021 *)
%o A010715 (PARI) a(n)=n%2*6+4 \\ _Charles R Greathouse IV_, Jul 13 2016
%K A010715 nonn,easy
%O A010715 0,1
%A A010715 _N. J. A. Sloane_