A191952 Number of simple mixed arrangements of n pseudolines and 2 double pseudolines in the projective plane.

1, 4, 48, 1329, 80253

Offset

0,2

Links

Table of n, a(n) for n=0..4.

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: A211049 A321076 A166231 * A013145 A013150 A353922

Adjacent sequences: A191949 A191950 A191951 * A191953 A191954 A191955

Keyword

nonn,more

Author

N. J. A. Sloane, Jun 20 2011

Status

approved