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

Author

Vladeta Jovovic, Jan 10 2000

Keywords

• nonn

Links

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

Crossrefs

The labeled version is A121252.

Column sums of A350908.

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

Formula

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

Extensions

Edited and extended by Max Alekseyev, Sep 18 2009