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Number of 2-connected planar maps with n edges.
(Formerly M0804)
1

%I M0804 #12 Jan 10 2018 17:19:01

%S 0,1,2,3,6,14,30,77,196,525,1414,3960,11056,31636,90818,264657,774146,

%T 2289787,6798562,20354005,61164374,184985060,561433922,1712696708,

%U 5241637812

%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 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_.