A361586 Number of digraphs on n unlabeled nodes in which every node belongs to a directed cycle.

1, 0, 1, 5, 90, 5289, 1071691, 712342075, 1585944117738, 12152982231404393, 328276896613548366675, 31834464336872565979301363, 11234630426387288679040317490771, 14576388456695908232721134339830232699, 70075904005979773819582865772534172929477101

Offset

0,4

Links

Table of n, a(n) for n=0..14.

Prog

(PARI) A361586seq(16) \\ See PARI link in A350794 for program code.

Crossrefs

Column k=0 of A361590.

The labeled version is A086366.

Cf. A350794.

Sequence in context: A361551 A323570 A295766 * A367500 A216693 A158073

Adjacent sequences: A361583 A361584 A361585 * A361587 A361588 A361589

Keyword

nonn

Author

Andrew Howroyd, Mar 16 2023

Status

approved