A350915 Number of weakly connected oriented graphs with n arcs.

1, 1, 3, 10, 39, 169, 876, 4834, 29316, 189054, 1294382, 9321232, 70326820, 553433559, 4528840412, 38432156859, 337454775045, 3059843449398, 28602687303185, 275222034228537, 2722343346822614, 27647618196693537, 287970349621911635, 3073082817450997700, 33568654163238906968

Offset

0,3

Links

Andrew Howroyd, Table of n, a(n) for n = 0..50

Prog

(PARI) \\ See A350734 for G, InvEulerMTS.
seq(n)=Vec(subst(Pol(InvEulerMTS(sum(i=0, n, G(i, y+O(y^n))*x^i, O(x*x^n)))), x, 1))

Crossrefs

Row sums of A350914.

Column sums of A350734.

Cf. A053454, A086345.

Sequence in context: A363555 A063688 A245378 * A221585 A083862 A205543

Adjacent sequences: A350912 A350913 A350914 * A350916 A350917 A350918

Keyword

nonn

Author

Andrew Howroyd, Jan 29 2022

Status

approved