%I #9 Feb 02 2021 19:33:28
%S 1,1,1,4,16,103,799,7286,71094,729974,7743818,84307887,937002302,
%T 10595117272,121568251909,1412555701804,16594126114458,
%U 196829590326284,2354703777373055,28385225424840078,344524656398655124,4207569734885041198,51674558137433627724
%N Number of unlabeled hexagonal 2-trees with n hexagons.
%H Andrew Howroyd, <a href="/A094637/b094637.txt">Table of n, a(n) for n = 0..200</a>
%H G. Labelle, C. Lamathe and P. Leroux, <a href="http://arXiv.org/abs/math.CO/0312424">Labeled and unlabeled enumeration of k-gonal 2-trees</a>, arXiv:math/0312424 [math.CO], Dec 23 2003.
%Y Column k=6 of A340811.
%Y Cf. A054581.
%K nonn
%O 0,4
%A _Vladeta Jovovic_, Jun 06 2004
%E Terms a(21) and beyond from _Andrew Howroyd_, Feb 02 2021