A361589 Number of acyclic digraphs on n unlabeled nodes without isolated nodes.

1, 0, 1, 4, 25, 271, 5682, 237684, 20042357, 3404651985, 1162523674892, 796395726736678, 1093229314594543016, 3004753338859186373234, 16527845763725396055765240, 181891586856152393087373330332, 4004313490358484085907684748704180, 176328671349936542115174881107633828418

Offset: 0

Author

Andrew Howroyd, Mar 16 2023

Keywords

• nonn

Crossrefs

Row sums of A361588.

Cf. A003087, A350794.

Programs

PARI

A361589seq(16) \\ See PARI link in A350794 for program code.

Formula

a(n) = A003087(n) - A003087(n-1) for n >= 1.