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%I #11 Oct 07 2019 11:15:31
%S 1,1,2,5,25,302,9194,556298
%N Number of simple mixed arrangements of n pseudolines and 1 double pseudoline in the projective plane.
%H J. Ferté, V. Pilaud and M. Pocchiola, <a href="https://arxiv.org/abs/1009.1575">On the number of simple arrangements of five double pseudolines</a>, arXiv:1009.1575 [cs.CG], 2010; Discrete Comput. Geom. 45 (2011), 279-302.
%K nonn,more
%O 0,3
%A _N. J. A. Sloane_, Jun 20 2011