This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A111564 #8 Dec 12 2014 19:21:29 %S A111564 1,2,4,10,25,80,277,1150,5291,26918,145744,828856,4872771,29395784, %T A111564 180857382,1130700488,7163245811,45895629266,296937363511, %U A111564 1937625709854,12739784808937,84331837321404,561647630439975,3761221057579892 %N A111564 Number of outerplanar graphs on n unlabeled nodes. %H A111564 M. Bordirsky, É. Fusy, M. Kang and S. Vigerske, <a href="http://www.arXiv.org/abs/math.CO/0511422">Enumeration of Unlabeled Outerplanar Graphs</a>, 2005 %H A111564 S. Vigerske, <a href="http://www.informatik.hu-berlin.de/Forschung_Lehre/algorithmen/en/forschung/planar/vigerske.html">Asymptotic enumeration of unlabeled outerplanar graphs, Diploma thesis</a>, Humboldt University Berlin, 2005 %H A111564 S. Vigerske, <a href="http://www.math.hu-berlin.de/~stefan">Homepage</a> %F A111564 Generating function and cycle index sum known, see Vigerske, or Bodirsky, Fusy, Kang and Vigerske. %Y A111564 Cf. A001004, A097999, A097998, A098000. %K A111564 nonn %O A111564 1,2 %A A111564 Stefan Vigerske, Nov 17 2005