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 A168616 #37 Sep 08 2022 08:45:49
%S A168616 -4,-3,-1,3,11,27,59,123,251,507,1019,2043,4091,8187,16379,32763,
%T A168616 65531,131067,262139,524283,1048571,2097147,4194299,8388603,16777211,
%U A168616 33554427,67108859,134217723,268435451,536870907,1073741819,2147483643
%N A168616 a(n) = 2^n - 5.
%H A168616 Vincenzo Librandi, <a href="/A168616/b168616.txt">Table of n, a(n) for n = 0..1000</a>
%H A168616 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature(3,-2).
%F A168616 a(n) = 2*a(n-1) + 5.
%F A168616 G.f. (9*x - 4)/((x-1)*(2*x-1)). - _R. J. Mathar_, Feb 22 2012
%F A168616 a(n) = 3*a(n-1) - 2*a(n-2). - _Vincenzo Librandi_, Sep 19 2013
%F A168616 E.g.f.: exp(2*x) - 5*exp(x). - _G. C. Greubel_, Jul 27 2016
%t A168616 Table[2^n-5,{n,0,5!}] (* _Vladimir Joseph Stephan Orlovsky_, Nov 22 2010 *)
%t A168616 CoefficientList[Series[(9 x - 4)/((x - 1) (2 x - 1)), {x, 0, 60}], x] (* _Vincenzo Librandi_, Sep 19 2013 *)
%t A168616 LinearRecurrence[{3,-2},{-4,-3},40] (* _Harvey P. Dale_, Oct 15 2014 *)
%o A168616 (Magma) [2^n-5: n in [0..40]]; // _Vincenzo Librandi_, Sep 19 2013
%o A168616 (PARI) a(n)=2^n-5 \\ _Charles R Greathouse IV_, Oct 07 2015
%K A168616 sign,easy
%O A168616 0,1
%A A168616 _Vincenzo Librandi_, Dec 01 2009
%E A168616 Formula and examples edited to use correct offset by _Jon E. Schoenfield_, Jun 19 2010