A139629 Row sums of A139624, number of 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).

1, 2, 6, 17

Offset

0,2

Links

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

Crossrefs

Cf. A139628, A139630.

Sequence in context: A317351 A296108 A118305 * A057497 A063627 A069014

Adjacent sequences: A139626 A139627 A139628 * A139630 A139631 A139632

Keyword

more,nonn

Author

Benoit Jubin, May 01 2008

Status

approved