A350796 - OEIS

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A350796

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

5

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

(list; graph; refs; listen; history; text; internal format)

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