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Number of Sona graphs.
1

%I #6 May 22 2013 11:03:12

%S 1,1,1,3,5,13,38,133,534

%N Number of Sona graphs.

%C See Table 1, column 2 of the paper by E. D. Demaine et al. for details.

%H E. D. Demaine, M. L. Demaine, P. Taslakian and G. T. Toussaint, <a href="http://www.tandfonline.com/doi/full/10.1080/17513470701413451">Sand drawings and Gaussian graphs</a>, Journal of Mathematics and the Arts, 1 (2007), 125-133.

%e The number of Sona graphs with nine faces is 534.

%K nonn,more

%O 1,4

%A _Parthasarathy Nambi_, Jan 22 2010