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 A155635 #13 Jan 17 2017 19:23:24
%S A155635 1,12,88,636,4720,35892,277768,2175276,17167840,136170852,1083507448,
%T A155635 8638762716,68963617360,550976517012,4404150026728,35214889666956,
%U A155635 281627564601280,2252562753138372,18018213206747608,144134261562183996
%N A155635 8^n+5^n-1.
%H A155635 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (14,-53,40).
%F A155635 G.f.: 1/(1-8*x)+1/(1-5*x)-1/(1-x). E.g.f.: e^(8*x)+e^(5*x)-e^x.
%F A155635 a(n)=13*a(n-1)-40*a(n-2)-28 with a(0)=1, a(1)=12 - _Vincenzo Librandi_, Jul 21 2010
%t A155635 Table[8^n+5^n-1,{n,0,40}] (* or *) LinearRecurrence[{14,-53,40},{1,12,88},40] (* _Harvey P. Dale_, Jan 17 2017 *)
%o A155635 (PARI) a(n)=8^n+5^n-1^n \\ _Charles R Greathouse IV_, Jun 11 2015
%Y A155635 Cf. A155596, A155597, A155598, A155599, A155600, A155601, A155622, A155623, A155624, A155625, A155626, A155627, A155628, A155629, A155630, A155631, A155632, A155633, A155634.
%K A155635 nonn,easy
%O A155635 0,2
%A A155635 _Mohammad K. Azarian_, Jan 30 2009