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Search: id:A063851
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| A063851 |
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Triangle T(n,k) (n >= 3, k = 1..n-2) giving number of nonisomorphic nondegenerate oriented matroids with n points in n-k dimensions. |
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4
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| 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 11, 11, 1, 1, 1, 135, 2628, 135, 1, 1, 1, 4382
(list; table; graph; listen)
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OFFSET
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3,10
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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; 1,1; 1,1,1; 1,1,1,4; 1,1,1,11,11; ...
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CROSSREFS
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For numbers when degenerate matroids are included see A063804. First diagonal gives A006248. Row sums give A063852.
Adjacent sequences: A063848 A063849 A063850 this_sequence A063852 A063853 A063854
Sequence in context: A127707 A113196 A037291 this_sequence A124777 A112622 A119591
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KEYWORD
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nonn,tabl,nice
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AUTHOR
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njas, Aug 26 2001
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