A053418 Number of unlabeled directed graphs with n arcs and no isolated vertices.

1, 1, 5, 17, 80, 365, 1981, 11222, 69511, 455663, 3169244, 23170347, 177513359, 1418920570, 11798710013, 101778754655, 908722427531, 8380602471646, 79692654473866, 780142956502644, 7851084073063731, 81120767066417308

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