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 A155657 #13 Aug 29 2024 17:48:16
%S A155657 1,16,148,1342,12400,116806,1117648,10823542,105764800,1040353606,
%T A155657 10282475248,101977326742,1013841287200,10096889010406,
%U A155657 100678223072848,1004747561509942,10033232930569600,100232630513987206
%N A155657 10^n+7^n-1.
%H A155657 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (18,-87,70).
%F A155657 G.f.: 1/(1-10*x)+1/(1-7*x)-1/(1-x). E.g.f.: e^(10*x)+e^(7*x)-e^x.
%F A155657 a(n)=17*a(n-1)-70*a(n-2)-54 with a(0)=1, a(1)=16 - _Vincenzo Librandi_, Jul 21 2010
%t A155657 Table[10^n+7^n-1,{n,0,30}] (* or *) LinearRecurrence[{18,-87,70},{1,16,148},30] (* _Harvey P. Dale_, Aug 29 2024 *)
%o A155657 (PARI) a(n)=10^n+7^n-1^n \\ _Charles R Greathouse IV_, Jun 11 2015
%Y A155657 Cf. A155638, A155639, A155640, A155641, A155642, A155643, A155644, A155645, A155646, A155647, A155648, A155649, A155650, A155651, A155652, A155653, A155654, A155655, A155656.
%K A155657 nonn,easy
%O A155657 0,2
%A A155657 _Mohammad K. Azarian_, Jan 31 2009