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 A083326 #15 Jan 05 2021 21:32:55
%S A083326 1,5,27,155,927,5675,35127,218195,1354527,8386715,51749127,318163235,
%T A083326 1949418927,11907099755,72529083927,440741148275,2672816984127,
%U A083326 16180899860795,97813978879527,590561131589315,3561890520050127
%N A083326 a(n) = 6^n - 5^n + 4^n.
%C A083326 An alternating sum of decreasing powers.
%C A083326 Binomial transform of A083325.
%H A083326 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (15,-74,120).
%F A083326 G.f.: (1-10*x+26*x^2)/((1-4*x)*(1-5*x)*(1-6*x)).
%F A083326 E.g.f.: exp(6x) - exp(5x) + exp(4x).
%p A083326 A083326:=n->6^n-5^n+4^n: seq(A083326(n), n=0..30); # _Wesley Ivan Hurt_, Jan 24 2017
%t A083326 Table[6^n-5^n+4^n,{n,0,20}] (* _Harvey P. Dale_, Feb 19 2013 *)
%K A083326 easy,nonn
%O A083326 0,2
%A A083326 _Paul Barry_, Apr 27 2003