%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_.