%I #12 May 09 2017 10:56:36
%S 1,1,2,5,13,46,172,777,3783,20074,111604,646409,3846640,23410035,
%T 144965988,910898943,5794179218,37248630398,241676806702,
%U 1580880366039,10416314047854,69080674190341,460841447382976,3090747326749823
%N Number of connected outerplanar graphs on n unlabeled nodes.
%H Manuel Bodirsky, Éric Fusy, Mihyun Kang and Stefan Vigerske, <a href="https://arxiv.org/abs/math/0511422">Enumeration of Unlabeled Outerplanar Graphs</a>, arXiv:math/0511422 [math.CO], 2005-2006.
%H S. Vigerske, <a href="http://www.math.hu-berlin.de/~stefan/thesis_enum_outerpl.ps.gz">Asymptotic enumeration of unlabeled outerplanar graphs</a>, Diploma thesis, Humboldt University Berlin, 2005.
%H S. Vigerske, <a href="https://www.math.hu-berlin.de/~stefan/fs_enum_outerpl.pdf">Asymptotic enumeration of unlabeled outerplanar graphs</a>, Slides, Diploma thesis, Humboldt University Berlin, 2005.
%H Stefan Vigerske, <a href="http://www.math.hu-berlin.de/~stefan">Homepage</a>
%F Generating function and cycle index sum known, see Vigerske or Bodirsky, Fusy, Kang and Vigerske.
%Y Cf. A001004, A097998, A098000.
%K nonn
%O 1,3
%A Stefan Vigerske, Nov 17 2005