A350752 Number of unlabeled strongly connected digraphs with n arcs.

1, 0, 1, 1, 3, 6, 25, 91, 442, 2241, 12591, 75180, 478648, 3211245, 22635956, 166828221, 1281518573, 10229858290, 84652925554, 724601312400, 6403522811765, 58327076550161, 546764617643250, 5267719312771122, 52096218005705959, 528285485054771639

Offset

0,5

Links

Table of n, a(n) for n=0..25.

Prog

(PARI) A350752seq(20) \\ See PARI link in A350489 for program code.

Crossrefs

Row sums of A350753.

Column sums of A057276.

Cf. A035512, A350489, A350751.

Sequence in context: A361288 A266549 A057730 * A355967 A074432 A212650

Adjacent sequences: A350749 A350750 A350751 * A350753 A350754 A350755

Keyword

nonn

Author

Andrew Howroyd, Jan 13 2022

Status

approved