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A139627 Row sums of A139622, number of strongly connected directed multigraphs with loops and no vertex of degree 0, with n arcs. 3
1, 1, 2, 4, 12, 37, 162 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..6.

CROSSREFS

Cf. A052171, A139626.

Sequence in context: A193049 A114500 A148212 * A149844 A149845 A217616

Adjacent sequences:  A139624 A139625 A139626 * A139628 A139629 A139630

KEYWORD

more,nonn

AUTHOR

Benoit Jubin, May 01 2008

EXTENSIONS

3 more terms. R. J. Mathar, Aug 04 2017

STATUS

approved

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Last modified May 12 17:59 EDT 2021. Contains 343829 sequences. (Running on oeis4.)