A094611 Number of unlabeled pentagonal 2-trees with n pentagons.

1, 1, 1, 3, 11, 56, 359, 2597, 20386, 167819, 1429815, 12500748, 111595289, 1013544057, 9340950309, 87176935700, 822559721606, 7836316493485, 75293711520236, 728968295958626, 7105984356424859, 69697524828651997, 687448151462822966, 6815174949649428254

Offset

0,4

Links

Andrew Howroyd, Table of n, a(n) for n = 0..200

G. Labelle, C. Lamathe and P. Leroux, Labeled and unlabeled enumeration of k-gonal 2-trees

Crossrefs

Column k=5 of A340811.

Cf. A054581.

Sequence in context: A036760 A000985 A207433 * A052442 A217034 A330351

Adjacent sequences: A094608 A094609 A094610 * A094612 A094613 A094614

Keyword

nonn

Author

Vladeta Jovovic, Jun 06 2004

Extensions

Terms a(21) and beyond from Andrew Howroyd, May 09 2021

Status

approved