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 A168614 #27 Sep 08 2022 08:45:49
%S A168614 6,7,9,13,21,37,69,133,261,517,1029,2053,4101,8197,16389,32773,65541,
%T A168614 131077,262149,524293,1048581,2097157,4194309,8388613,16777221,
%U A168614 33554437,67108869,134217733,268435461,536870917,1073741829,2147483653
%N A168614 a(n) = 2^n + 5.
%H A168614 Vincenzo Librandi, <a href="/A168614/b168614.txt">Table of n, a(n) for n = 0..1000</a>
%H A168614 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (3,-2).
%F A168614 a(n) = 2*a(n-1) - 5 with n>0, a(0)=6.
%F A168614 From _Colin Barker_, Jul 01 2012: (Start)
%F A168614 a(n) = 3*a(n-1) - 2*a(n-2).
%F A168614 G.f.: (6 - 11*x)/((1-x)*(1-2*x)). (End)
%F A168614 E.g.f.: exp(2*x) + 5*exp(x). - _G. C. Greubel_, Jul 27 2016
%t A168614 a[n_]:=2^n+5; a[Range[0,200]] (* _Vladimir Joseph Stephan Orlovsky_, Feb 20 2011*)
%t A168614 CoefficientList[Series[(6 - 11 x)/((1 - x) (1 - 2 x)), {x, 0, 40}], x] (* _Vincenzo Librandi_, Sep 19 2013 *)
%o A168614 (Magma) [2^n+5: n in [0..40]]; // _Vincenzo Librandi_, Sep 19 2013
%o A168614 (PARI) a(n)=2^n+5 \\ _Charles R Greathouse IV_, Oct 27 2014
%K A168614 nonn,easy
%O A168614 0,1
%A A168614 _Vincenzo Librandi_, Dec 01 2009
%E A168614 Checked by _Michael B. Porter_, Jun 16 2010