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 A028130 #20 Aug 31 2018 19:26:38
%S A028130 1,25,395,5045,56931,592725,5834515,55132165,505157411,4519668725,
%T A028130 39685517235,343261312485,2933027514691,24811827085525,
%U A028130 208162421081555,1734382406904005,14367095262780771,118431759773683125
%N A028130 Expansion of 1/((1-4x)(1-6x)(1-7x)(1-8x)).
%H A028130 Harvey P. Dale, <a href="/A028130/b028130.txt">Table of n, a(n) for n = 0..1000</a>
%H A028130 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (25,-230,920,-1344).
%F A028130 From _Vincenzo Librandi_, Mar 17 2011: (Start)
%F A028130 a(n) = 25*a(n-1) - 230*a(n-2) + 920*a(n-3) - 1344*a(n-4), n >= 4.
%F A028130 a(n) = 15*a(n-1) - 56*a(n-2) - 2*4^n + 3*6^n, n >= 2. (End)
%F A028130 a(n) = -7^(n+3)/3 - 2*4^(n+1)/3 + 9*6^(n+1) + 8^(n+2). - _R. J. Mathar_, Mar 18 2011
%t A028130 CoefficientList[Series[1/((1-4x)(1-6x)(1-7x)(1-8x)),{x,0,30}],x] (* or *) LinearRecurrence[{25,-230,920,-1344},{1,25,395,5045},30] (* _Harvey P. Dale_, Jun 19 2014 *)
%o A028130 (PARI) Vec(1/((1-4*x)*(1-6*x)*(1-7*x)*(1-8*x))+O(x^99)) \\ _Charles R Greathouse IV_, Sep 27 2012
%K A028130 nonn,easy
%O A028130 0,2
%A A028130 _N. J. A. Sloane_