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 A079307 #4 May 10 2013 12:45:09 %S A079307 1,2,47,3537,990504,1052216730,4368243719790,71899754628285990, %T A079307 4719127231162959826680,1237680394434222243386835240, %U A079307 1297992518900121521819851167607200 %N A079307 Number of n-node labeled mating digraphs whose complements are connected. %Y A079307 Cf. A006024, A006025, A079306. %K A079307 nonn %O A079307 1,2 %A A079307 _Vladeta Jovovic_, Feb 09 2003