A006394 - OEIS

%I M2498 #17 Mar 30 2017 15:27:10

%S 1,1,3,5,15,52,213,1002,5167,27967,158447,926786

%N Number of connected planar maps with n nodes and without loops or parallel edges.

%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 1,3

%A _N. J. A. Sloane_

%E a(9)-a(12) from _Sean A. Irvine_, Mar 30 2017