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 A083320 #10 Jan 05 2021 21:32:49
%S A083320 1,6,32,162,800,3906,18992,92322,449600,2195586,10755152,52845282,
%T A083320 260386400,1286217666,6367168112,31576971042,156839811200,
%U A083320 779990182146,3883029321872,19347201973602,96463456484000,481224744361026
%N A083320 a(n) = 5^n + 4^n - 3^n.
%C A083320 Binomial transform of A083319.
%H A083320 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (12,-47,60).
%F A083320 a(n) = 5^n + 4^n - 3^n.
%F A083320 G.f.: (1-6x+7x^2)/((1-3x)(1-4x)(1-5x)).
%F A083320 E.g.f.: exp(5x) + exp(4x) - exp(3x).
%t A083320 Table[5^n+4^n-3^n,{n,0,30}] (* or *) LinearRecurrence[{12,-47,60},{1,6,32},30] (* _Harvey P. Dale_, Aug 19 2020 *)
%K A083320 easy,nonn
%O A083320 0,2
%A A083320 _Paul Barry_, Apr 25 2003