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 A139630 #2 Mar 31 2012 10:31:22 %S A139630 1,1,1,1,2,3,7,11,20,30,47,71,117,201,369,703,1323,2463,4446 %N A139630 Row sums of A139625, number of strongly connected directed multigraphs with loops and no vertex of degree 0, with n arcs, which are transitive (the existence of a path between two points implies the existence of an arc between those two points). %Y A139630 Cf. A139628, A139629. %K A139630 nonn %O A139630 0,5 %A A139630 _Benoit Jubin_, May 01 2008