A308128 Isomorphism classes of connected Eulerian digraphs with n vertices, allowing loops.

1, 2, 3, 14, 112, 2174, 124501, 22400498, 13010949171, 24926846389076, 160810397320789069, 3554744065897655673978, 273140190737719436311559660, 73831786956788218320014098284918, 70920392983384812245087697080226658475, 244186402549448674084991238687021028510453186

Offset: 0

Author

Alois P. Heinz, May 14 2019, following a suggestion from Brendan McKay

Keywords

• nonn
• hard

Crossrefs

Cf. A058338, A229865, A308111.

Formula

Inverse Euler transform of A308111.

Extensions

Terms a(10) and beyond from Andrew Howroyd, Apr 12 2020