A094653 Number of unlabeled 9-gonal 2-trees with n 9-gons.

1, 1, 1, 5, 32, 343, 4505, 66603, 1045335, 17115162, 289107854, 5007144433, 88516438360, 1591949961503, 29053438148676, 536972307386326, 10034276171127780, 189331187319203010, 3603141751525175854, 69097496637591215442, 1334213677527481808220, 25922717218623692348237

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, arXiv:math/0312424 [math.CO], Dec 23 2003.

Crossrefs

Column k=9 of A340811.

Cf. A054581.

Sequence in context: A023882 A109780 A093448 * A135250 A006926 A185136

Adjacent sequences: A094650 A094651 A094652 * A094654 A094655 A094656

Keyword

nonn

Author

Vladeta Jovovic, Jun 06 2004

Extensions

Terms a(19) and beyond from Andrew Howroyd, Feb 02 2021

Status

approved