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 A083328 #8 Jan 05 2021 21:33:06 %S A083328 0,1,9,64,423,2716,17199,108004,673983,4183516,25845039,158993044, %T A083328 974443743,5952752716,36262150479,220363399684,1336386968703, %U A083328 8090385360316,48906795729519,295279984663924,1780943516632863 %N A083328 a(n) = (6^n - 5^n + 4^n - 3^n)/2. %C A083328 Binomial transform of A083327. %H A083328 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (18,-119,342,-360). %F A083328 G.f.: x(1-9x+21x^2)/((1-3x)(1-4x)(1-5x)(1-6x)). %F A083328 E.g.f.: exp(6x) - exp(5x) + exp(4x) - exp(3x). %K A083328 easy,nonn %O A083328 0,3 %A A083328 _Paul Barry_, Apr 27 2003