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 A058803 #2 Mar 30 2012 17:37:12 %S A058803 1,1,2,0,12,140,2910,83202,3170216,154933704,9441522810,701275774430, %T A058803 62304994315212,6517432341289740,791949368757587222, %U A058803 110496962589020946330,17525486812000086847440 %N A058803 Vertically indecomposable lattices on n labeled nodes. %Y A058803 a(n)=A058804(n)*n=A058805(n)*n*(n-1). %K A058803 nonn,hard %O A058803 0,3 %A A058803 _Christian G. Bower_, Dec 28 2000