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A191937
Number of simple arrangements of pseudolines of order n.
0
1, 1, 1, 13, 6570, 181403533
OFFSET
0,4
LINKS
J. Ferté, V. Pilaud and M. Pocchiola, On the number of simple arrangements of five double pseudolines, arXiv:1009.1575 [cs.CG], 2010; Discrete Comput. Geom. 45 (2011), 279-302.
CROSSREFS
Sequence in context: A032463 A298273 A203585 * A210157 A213410 A013524
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jun 19 2011
STATUS
approved