A350492 Number of unlabeled acyclic digraphs with n arcs and a global source and sink.

1, 1, 1, 2, 5, 14, 44, 153, 584, 2414, 10732, 50909, 256198, 1360645, 7593530, 44366458, 270517289, 1716555943, 11308051214, 77170484915, 544525867544, 3965944595335, 29769162604337, 229970873746105, 1826057472681595, 14886348784740516

Offset

0,4

Links

Andrew Howroyd, Table of n, a(n) for n = 0..40

Prog

(PARI) A350492seq(20) \\ See PARI link in A122078 for program code.

Crossrefs

Column sums of A350491.

Cf. A122078, A345258, A350451, A350490.

Sequence in context: A204064 A081558 A202059 * A014322 A095148 A368636

Adjacent sequences: A350489 A350490 A350491 * A350493 A350494 A350495

Keyword

nonn

Author

Andrew Howroyd, Jan 08 2022

Status

approved