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 A004058 #14 Sep 08 2022 08:44:32 %S A004058 1,12,99,686,4305,25368,143263,785202,4211229,22226204,115899147, %T A004058 598832598,3072304873,15676477920,79649367351,403336249274, %U A004058 2037103422837,10267399442916,51665107485475 %N A004058 Expansion of (1-x)/( (1+x)*(1-2*x)*(1-3*x)*(1-4*x)*(1-5*x)). %H A004058 Vincenzo Librandi, <a href="/A004058/b004058.txt">Table of n, a(n) for n = 0..1000</a> %H A004058 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (13,-57,83,34,-120). %F A004058 a(n) = (1/180)*(2500*5^n - 3456*4^n + 1215*3^n - 80*2^n + (-1)^n). %o A004058 (Magma) [(1/180) *(2500*5^n - 3456*4^n + 1215*3^n - 80*2^n + (-1)^n): n in [0..30]]; // _Vincenzo Librandi_, Oct 08 2011 %Y A004058 First differences of A099111. %K A004058 nonn,easy %O A004058 0,2 %A A004058 _N. J. A. Sloane_