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 A102598 #3 May 10 2013 12:45:40 %S A102598 1,2,7,102,5034,886456 %N A102598 Number of n-node unlabeled connected digraphs whose underlying graphs are mating graphs, cf. A006024. %K A102598 more,nonn %O A102598 1,2 %A A102598 Goran Kilibarda, Zoran Maksimovic, _Vladeta Jovovic_, Jan 22 2005