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 A028212 #20 Mar 13 2025 17:48:25
%S A028212 1,35,775,13895,220591,3239495,45114175,605081015,7896440431,
%T A028212 100983137255,1271943884575,15837914099735,195494604120271,
%U A028212 2397051804927815,29242027752046975,355340314794184055,4305125050033912111,52039828472216683175,627954645427055761375
%N A028212 Expansion of 1/((1-6x)(1-8x)(1-9x)(1-12x)).
%H A028212 Harvey P. Dale, <a href="/A028212/b028212.txt">Table of n, a(n) for n = 0..925</a>
%H A028212 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (35,-450,2520,-5184)
%F A028212 a(n) = 8^(n+2) - 9^(n+2) + 2*12^(n+1) - 6^(n+1). - _R. J. Mathar_, Mar 14 2011
%F A028212 a(n) = 35*a(n-1) - 450*a(n-2) + 2520*a(n-3) - 5184*a(n-4); a(0)=1, a(1)=35, a(2)=775, a(3)=13895. - _Vincenzo Librandi_, Mar 14 2011
%t A028212 CoefficientList[Series[1/((1-6x)(1-8x)(1-9x)(1-12x)),{x,0,20}],x] (* or *) LinearRecurrence[{35,-450,2520,-5184},{1,35,775,13895},20] (* _Harvey P. Dale_, Mar 13 2025 *)
%K A028212 nonn
%O A028212 0,2
%A A028212 _N. J. A. Sloane_