A191960 Number of mixed arrangements of n pseudolines and 2 double pseudolines in the projective plane.

1, 9, 265, 18532

Offset

0,2

Links

Table of n, a(n) for n=0..3.

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: A188963 A306535 A144684 * A168600 A088672 A300169

Adjacent sequences: A191957 A191958 A191959 * A191961 A191962 A191963

Keyword

nonn,more

Author

N. J. A. Sloane, Jun 20 2011

Status

approved