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 A011791 #6 Nov 17 2017 17:20:25 %S A011791 1,2,8,35,169,862,4575,24999,139700,794684,4586377,26788423,158054285, %T A011791 940603900 %N A011791 Number of directed animals on a certain lattice. %H A011791 S. Ramanujan, <a href="http://www.imsc.res.in/~rao/ramanujan/NoteBooks/NoteBook2/chapterIII/page6.htm">Notebook entry</a> %Y A011791 Cf. A259757. %K A011791 nonn %O A011791 0,2 %A A011791 Alain Denise (Alain.Denise(AT)lri.fr)