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 A190954 #27 Dec 23 2023 16:43:22
%S A190954 0,1,10,104,1080,11216,116480,1209664,12562560,130464256,1354892800,
%T A190954 14070785024,146127421440,1517557354496,15760083230720,
%U A190954 163671061725184,1699750950174720,17652193748647936,183320941287178240,1903818187866374144,19771465643812454400
%N A190954 a(n) = 10*a(n-1) + 4*a(n-2), with a(0)=0, a(1)=1.
%H A190954 G. C. Greubel, <a href="/A190954/b190954.txt">Table of n, a(n) for n = 0..970</a>
%H A190954 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (10,4).
%F A190954 G.f.: x/(1 - 10*x - 4*x^2). - _R. J. Mathar_, Nov 21 2011
%t A190954 LinearRecurrence[{10,4}, {0,1}, 50]
%t A190954 CoefficientList[Series[x/(1-10*x-4*x^2), {x,0,50}], x] (* _G. C. Greubel_, Jan 24 2018 *)
%o A190954 (PARI) x='x+O('x^30); concat([0], Vec(x/(1-10*x-4*x^2))) \\ _G. C. Greubel_, Jan 24 2018
%o A190954 (Magma) I:=[0,1]; [n le 2 select I[n] else 10*Self(n-1) + 4*Self(n-2): n in [1..30]]; // _G. C. Greubel_, Jan 24 2018
%K A190954 nonn,easy
%O A190954 0,3
%A A190954 _Vladimir Joseph Stephan Orlovsky_, May 24 2011