%I #16 Nov 20 2023 04:19:36
%S 1,1,5,17,80,365,1981,11222,69511,455663,3169244,23170347,177513359,
%T 1418920570,11798710013,101778754655,908722427531,8380602471646,
%U 79692654473866,780142956502644,7851084073063731,81120767066417308
%N Number of unlabeled directed graphs with n arcs and no isolated vertices.
%H Andrew Howroyd, <a href="/A053418/b053418.txt">Table of n, a(n) for n = 0..50</a>
%F Euler transform of A053454. - _Andrew Howroyd_, Jan 28 2022
%Y The labeled version is A121252.
%Y Column sums of A350908.
%Y Cf. A000273, A000664, A053454, A053598 (by # of nodes).
%K nonn
%O 0,3
%A _Vladeta Jovovic_, Jan 10 2000
%E Edited and extended by _Max Alekseyev_, Sep 18 2009