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%I #6 May 09 2021 18:36:10
%S 1,1,1,3,8,32,141,749,4304,26492,169263,1115015,7507211,51466500,
%T 358100288,2523472751,17978488711,129325796854,938234533024,
%U 6858551493579,50478955083341,373815860588360,2783730088637429,20835514668765200,156675846789962554,1183195305751233833
%N Number of unlabeled 4-gonal 2-trees with n 4-gons.
%H Andrew Howroyd, <a href="/A094610/b094610.txt">Table of n, a(n) for n = 0..500</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>
%Y Column k=4 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_, May 09 2021
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