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Number of unsensed planar maps with n edges and without loops or isthmuses.
(Formerly M1162)
0

%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