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A053418 Number of unlabeled directed graphs with n arcs and no isolated vertices. 3
1, 1, 5, 17, 80, 365, 1981, 11222, 69511, 455663, 3169244, 23170347, 177513359, 1418920570, 11798710013, 101778754655, 908722427531, 8380602471646, 79692654473866, 780142956502644, 7851084073063731, 81120767066417308 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Cf. A000273, A000664.

Sequence in context: A149747 A149748 A151494 * A151882 A149749 A149750

Adjacent sequences:  A053415 A053416 A053417 * A053419 A053420 A053421

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jan 10 2000

EXTENSIONS

Edited and extended by Max Alekseyev, Sep 18 2009

STATUS

approved

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Last modified October 22 01:42 EDT 2018. Contains 316431 sequences. (Running on oeis4.)