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%I #9 Feb 02 2021 19:47:12
%S 1,1,1,5,26,245,2737,35291,483819,6937913,102666626,1558022255,
%T 24133790815,380320794122,6081804068869,98490990290897,
%U 1612634990857755,26660840123167203,444560998431678554,7469779489114328514,126375763235359105446,2151342943131421629636
%N Number of unlabeled octagonal 2-trees with n octagons.
%H Andrew Howroyd, <a href="/A094652/b094652.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=8 of A340811.
%Y Cf. A054581.
%K nonn
%O 0,4
%A _Vladeta Jovovic_, Jun 06 2004
%E Terms a(20) and beyond from _Andrew Howroyd_, Feb 02 2021