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Search: id:A063804
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| A063804 |
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Triangle T(n,k) (n >= 3, k = 1..n-2) giving number of nonisomorphic oriented matroids with n points in n-k dimensions. |
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7
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| 1, 1, 2, 1, 3, 4, 1, 4, 12, 17, 1, 5, 25, 206, 143, 1, 6, 50, 6029, 181472, 4890, 1, 7, 91, 508321
(list; table; graph; listen)
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OFFSET
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3,3
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LINKS
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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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EXAMPLE
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1; 1,2; 1,3,4; 1,4,12,17; ...
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CROSSREFS
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Diagonals give A063800-A063803. Row sums give A063805. For nondegenerate matroids see A063851.
Sequence in context: A137649 A104002 A073135 this_sequence A078753 A119443 A126198
Adjacent sequences: A063801 A063802 A063803 this_sequence A063805 A063806 A063807
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KEYWORD
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nonn,tabl,nice
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AUTHOR
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njas, Aug 20 2001
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