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 A094651 Number of unlabeled heptagonal 2-trees with n heptagons. 2
 1, 1, 1, 4, 20, 158, 1539, 16970, 199879, 2460350, 31266165, 407461893, 5420228329, 73352481577, 1007312969202, 14008437540003, 196963172193733, 2796235114720116, 40038505601111596, 577693117173844307, 8392528734991449808, 122680472402091278920, 1803416089912665770579 (list; graph; refs; listen; history; text; internal format)
 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=7 of A340811. Cf. A054581. Sequence in context: A006682 A115852 A058381 * A065526 A032333 A357666 Adjacent sequences: A094648 A094649 A094650 * A094652 A094653 A094654 KEYWORD nonn AUTHOR Vladeta Jovovic, Jun 06 2004 EXTENSIONS Terms a(20) and beyond from Andrew Howroyd, Feb 02 2021 STATUS approved

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Last modified November 29 09:15 EST 2022. Contains 358422 sequences. (Running on oeis4.)