A350794 Number of digraphs on n unlabeled nodes with a global source and sink.

1, 1, 2, 20, 574, 48854, 12444800, 9849180230, 25265372689314, 218451490123178684, 6562780921564838071734, 700270642102506752862044142, 269621199012416753533007480951824, 378982029174285293421133982496722212766, 1962119228020498122395242424575089505014761082

Offset: 1

Author

Andrew Howroyd, Jan 19 2022

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..50
• Andrew Howroyd, PARI Program, Jan 2022, updated Mar 2023.

Crossrefs

The labeled version is A350790.

Row sums of A350795.

Cf. A049531, A051421, A345258, A350360, A350796.

Programs

PARI

A350794seq(15) \\ See link for program code.