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Number of planar maps with n edges and without faces or vertices of degree 1.
(Formerly M1238)
0

%I M1238 #19 Mar 29 2017 03:12:14

%S 1,2,4,10,36,132,616,3060,16207,88990,503816

%N Number of planar maps with n edges and without faces or vertices of degree 1.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H 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 nonn,more

%O 2,2

%A _N. J. A. Sloane_

%E a(9)-a(12) from _Sean A. Irvine_, Mar 28 2017