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Row sums of A139623, number of 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).
4

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

%S 1,2,9,33

%N Row sums of A139623, number of 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. A139629, A139630.

%K more,nonn

%O 0,2

%A _Benoit Jubin_, May 01 2008