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%I M1162 #12 Mar 29 2017 19:52:25
%S 1,2,4,8,27,76,295,1188,5462,26580,138110
%N Number of unsensed planar maps with n edges and without loops or isthmuses.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%D Walsh, T. R. S.; Generating nonisomorphic maps without storing them. SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.
%K nonn
%O 2,2
%A _N. J. A. Sloane_.
%E a(9)-a(12) from _Sean A. Irvine_, Mar 29 2017
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