A350796 Number of unlabeled digraphs with n arcs and a global source and sink.

1, 1, 1, 2, 7, 25, 108, 513, 2690, 15230, 92361, 594669, 4040283, 28817783, 214898429, 1669663193, 13476692136, 112722792293, 974931812942, 8702563358405, 80039193725904, 757342429877879, 7362651015248190, 73451961108974776, 751144076656119144, 7866092802569673370

Offset

0,4

Links

Table of n, a(n) for n=0..25.

Prog

(PARI) A350796seq(15) \\ See PARI link in A350794 for program code.

Crossrefs

Column sums of A350795.

Cf. A350752, A350794, A350798, A350906, A350907.

Sequence in context: A150532 A074420 A005034 * A245157 A150533 A150534

Adjacent sequences: A350793 A350794 A350795 * A350797 A350798 A350799

Keyword

nonn

Author

Andrew Howroyd, Jan 21 2022

Status

approved