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 A010730 #26 Jul 08 2025 01:45:02
%S A010730 7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,
%T A010730 10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,7,10,
%U A010730 7,10,7,10,7,10,7,10,7,10,7,10
%N A010730 a(n) = (17 -3*(-1)^n)/2.
%C A010730 Period 2.
%H A010730 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
%F A010730 G.f.: ( -7-10*x ) / ( (x-1)*(1+x) ). - _R. J. Mathar_, Nov 21 2011
%F A010730 a(n) = 7 + 2^(1 - (-1)^n) - 1. - _Vincenzo Librandi_, Feb 28 2020
%t A010730 PadRight[{},120,{7,10}] (* _Harvey P. Dale_, Jul 08 2019 *)
%o A010730 (Magma) &cat [[7, 10]^^50]; // _Vincenzo Librandi_, Feb 28 2020
%K A010730 nonn
%O A010730 0,1
%A A010730 _N. J. A. Sloane_