A063854 Number of abstract order types of configurations of n points in 2 dimensions.

1, 3, 11, 93, 2121, 122508, 15296266

Offset

3,2

Links

Table of n, a(n) for n=3..9.

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.

Lukas Finschi, A Graph Theoretical Approach for Reconstruction and Generation of Oriented Matroids, A dissertation submitted to the Swiss Federal Institute of Technology, Zurich for the degree of Doctor of Mathematics, 2001.

Lukas Finschi, Homepage of Oriented Matroids

L. Finschi and K. Fukuda, Complete combinatorial generation of small point set configurations and hyperplane arrangements, pp. 97-100 in Abstracts 13th Canadian Conference on Computational Geometry (CCCG '01), Waterloo, Aug. 13-15, 2001.

Crossrefs

A diagonal of A063853.

Sequence in context: A297485 A231066 A091547 * A066384 A328810 A120587

Adjacent sequences: A063851 A063852 A063853 * A063855 A063856 A063857

Keyword

nonn,more

Author

N. J. A. Sloane, Aug 26 2001

Status

approved