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A094656
Number of unlabeled 12-gonal 2-trees with n 12-gons.
2
1, 1, 1, 7, 55, 840, 15189, 309607, 6671842, 149850849, 3471296793, 82442359291, 1998559329142, 49290785442796, 1233639304644946, 31268489727956101, 801335133177932829, 20736286803363051714, 541224489038545084067, 14234799536039481373552, 376974819516101224941091
OFFSET
0,4
LINKS
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=12 of A340811.
Cf. A054581.
Sequence in context: A365030 A180829 A227544 * A239156 A117993 A055056
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Jun 06 2004
EXTENSIONS
Terms a(19) and beyond from Andrew Howroyd, Feb 02 2021
STATUS
approved