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 A112001 #6 Jul 09 2017 08:42:38 %S A112001 6,-231,6608,-176330,4714710,-130014885,3745101360,-113311778580, %T A112001 3608430175350,-120977128347075,4267052705916000,-158151857368254750, %U A112001 6150573832264611750,-250598489767931930625,10680148143520635780000,-475373543975596731465000 %N A112001 One fourth of fourth column (k=3) of triangle A111999. %F A112001 a(n)=A112492(n+4, 3)/4, n>=0. %F A112001 Conjecture: +n*(20*n^2+75*n+67)*a(n) +(2*n+5)*(n+2)*(20*n^2+115*n+162)*a(n-1)=0. - _R. J. Mathar_, Jul 09 2017 %K A112001 sign,easy %O A112001 0,1 %A A112001 _Wolfdieter Lang_, Sep 12 2005