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Number of 2-connected planar maps with n edges.
(Formerly M0808)
2

%I M0808 #13 Jan 10 2018 17:19:00

%S 0,1,2,3,6,15,36,114,396,1565,6756,31563,154370,785113,4099948,

%T 21870704,118624544,652485364,3631820462,20426666644,115949791342,

%U 663640383400

%N Number of 2-connected planar maps with n edges.

%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.

%D T. R. S. Walsh, personal communication.

%H T. R. S. Walsh, <a href="/A007401/a007401.pdf">Number of sensed planar maps with n edges and m vertices</a>

%K nonn

%O 1,3

%A _N. J. A. Sloane_.