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%I A006401 M1384 #15 Mar 31 2017 03:50:15
%S A006401 1,1,2,5,10,28,86,285,1055,4211
%N A006401 Number of connected planar maps without vertices of degree 1.
%D A006401 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A006401 Timothy R. Walsh, <a href="http://dx.doi.org/10.1137/0604018">Generating nonisomorphic maps without storing them</a>, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.
%K A006401 nonn,more
%O A006401 3,3
%A A006401 _N. J. A. Sloane_.
%E A006401 a(11)-a(12) from _Sean A. Irvine_, Mar 31 2017

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