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A063854
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Abstract order types of configurations of n points in 2 dimensions.
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2
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OFFSET
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3,2
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REFERENCES
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J. Ferte, V. Pilaud and M. Pocchiola, On the number of simple arrangements of five double pseudolines. Discrete Comput. Geom. 45 (2011), 279-302.
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LINKS
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Table of n, a(n) for n=3..9.
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 13-th Canadian Conference on Computational Geometry (CCCG '01), Waterloo, Aug. 13-15, 2001.
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CROSSREFS
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A diagonal of A063853.
Sequence in context: A157980 A092148 A091547 * A066384 A120587 A086914
Adjacent sequences: A063851 A063852 A063853 * A063855 A063856 A063857
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Aug 26 2001
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STATUS
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approved
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