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 A155658 #17 Sep 08 2022 08:45:40
%S A155658 1,17,169,1673,17041,177857,1889209,20310713,220123681,2398301297,
%T A155658 26219899849,287288997353,3152269663921,34619601154337,
%U A155658 380428056656089,4181995730925593,45982962794141761,505679659013280977
%N A155658 a(n) = 11^n + 7^n - 1.
%H A155658 G. C. Greubel, <a href="/A155658/b155658.txt">Table of n, a(n) for n = 0..958</a>
%H A155658 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (19,-95,77).
%F A155658 G.f.: 1/(1-11*x) + 1/(1-7*x) - 1/(1-x).
%F A155658 E.g.f.: exp(11*x) + exp(7*x) - exp(x).
%F A155658 a(n) = 18*a(n-1)-77*a(n-2)-60 with a(0)=1, a(1)=17. - _Vincenzo Librandi_, Jul 21 2010
%t A155658 Table[11^n+7^n-1, {n,0,20}] (* _G. C. Greubel_, Nov 18 2018 *)
%o A155658 (PARI) a(n)=11^n+7^n-1 \\ _Charles R Greathouse IV_, Jun 11 2015
%o A155658 (Magma) [11^n+7^n-1: n in [0..20]]; // _G. C. Greubel_, Nov 18 2018
%o A155658 (Sage) [11^n+7^n-1 for n in range(20)] # _G. C. Greubel_, Nov 18 2018
%o A155658 (GAP) List([0..20], n -> 11^n+7^n-1); # _G. C. Greubel_, Nov 18 2018
%Y A155658 Cf. A155638, A155639, A155640, A155641, A155642, A155643, A155644, A155645, A155646, A155647, A155648, A155649, A155650, A155651, A155652, A155653, A155654, A155655, A155656, A155657.
%K A155658 nonn,easy
%O A155658 0,2
%A A155658 _Mohammad K. Azarian_, Jan 31 2009