%I #11 Mar 10 2023 10:09:14
%S 1,3,16,218,9026,907123
%N Number of unlabeled simple planar digraphs with n nodes.
%D M. Kirchweger, M. Scheucher, and S. Szeider, SAT-Based Generation of Planar Graphs, in preparation.
%Y Directed variant of A005470.
%Y Cf. A000273
%K nonn,more
%O 1,2
%A _Manfred Scheucher_, Mar 09 2023