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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).
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%I #2 Mar 31 2012 10:31:22

%S 1,1,1,1,2,3,7,11,20,30,47,71,117,201,369,703,1323,2463,4446

%N 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 Cf. A139628, A139629.

%K nonn

%O 0,5

%A _Benoit Jubin_, May 01 2008