A191951 Number of simple mixed arrangements of n pseudolines and 1 double pseudoline in the projective plane.

1, 1, 2, 5, 25, 302, 9194, 556298

Offset

0,3

Links

Table of n, a(n) for n=0..7.

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: A139007 A015486 A378327 * A356674 A370555 A120767

Adjacent sequences: A191948 A191949 A191950 * A191952 A191953 A191954

Keyword

nonn,more

Author

N. J. A. Sloane, Jun 20 2011

Status

approved