A053418 - OEIS

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A053418

Number of unlabeled directed graphs with n arcs and no isolated vertices.

7

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

Andrew Howroyd, Table of n, a(n) for n = 0..50

FORMULA

Euler transform of A053454. - Andrew Howroyd, Jan 28 2022

CROSSREFS

The labeled version is A121252.

Column sums of A350908.

Cf. A000273, A000664, A053454, A053598 (by # of nodes).

Sequence in context: A151494 A307052 A369262 * A151882 A359206 A149749

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