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A063800 Number of nonisomorphic oriented matroids with n points in 2 dimensions. 3
1, 2, 4, 17, 143, 4890, 461053, 95052532 (list; graph; refs; listen; history; text; internal format)



Table of n, a(n) for n=3..10.

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.

L. 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.

Fukuda, Komei; Miyata, Hiroyuki; Moriyama, Sonoko. Complete Enumeration of Small Realizable Oriented Matroids. Discrete Comput. Geom. 49 (2013), no. 2, 359--381. MR3017917. Also arXiv:1204.0645. - From N. J. A. Sloane, Feb 16 2013


A diagonal of A063804.

Sequence in context: A307125 A247260 A048872 * A207137 A143674 A136147

Adjacent sequences:  A063797 A063798 A063799 * A063801 A063802 A063803




N. J. A. Sloane, Aug 20 2001



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Last modified August 15 10:43 EDT 2020. Contains 336492 sequences. (Running on oeis4.)