A191937 - OEIS

%I #10 Oct 07 2019 11:10:15

%S 1,1,1,13,6570,181403533

%N Number of simple arrangements of pseudolines of order n.

%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 0,4

%A _N. J. A. Sloane_, Jun 19 2011