A139628 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).

1, 2, 9, 33

Offset

0,2

Links

Table of n, a(n) for n=0..3.

Crossrefs

Cf. A139629, A139630.

Sequence in context: A036505 A264234 A056916 * A170872 A123142 A122097

Adjacent sequences: A139625 A139626 A139627 * A139629 A139630 A139631

Keyword

more,nonn

Author

Benoit Jubin, May 01 2008

Status

approved