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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). 4
1, 2, 6, 17 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 10 15:51 EDT 2021. Contains 343775 sequences. (Running on oeis4.)