%I #15 Apr 12 2020 15:45:01
%S 1,2,3,14,112,2174,124501,22400498,13010949171,24926846389076,
%T 160810397320789069,3554744065897655673978,
%U 273140190737719436311559660,73831786956788218320014098284918,70920392983384812245087697080226658475,244186402549448674084991238687021028510453186
%N Isomorphism classes of connected Eulerian digraphs with n vertices, allowing loops.
%F Inverse Euler transform of A308111.
%Y Cf. A058338, A229865, A308111.
%K nonn,hard
%O 0,2
%A _Alois P. Heinz_, May 14 2019, following a suggestion from _Brendan McKay_
%E Terms a(10) and beyond from _Andrew Howroyd_, Apr 12 2020