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Search: id:A058731
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| A058731 |
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Number of nonisomorphic simple matroids of rank 3 on n unlabeled points. |
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+0
4
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| 0, 0, 0, 1, 2, 4, 9, 23, 68, 383, 5249, 232928, 28872972
(list; graph; listen)
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OFFSET
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0,5
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LINKS
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W. M. B. Dukes, Tables of matroids
W. M. B. Dukes, Counting and Probability in Matroid Theory, Ph.D. Thesis, Trinity College, Dublin, 2000.
Index entries for sequences related to matroids
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CROSSREFS
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Equals A001200 - 1 (see that entry for further information).
A diagonal of A058730.
Sequence in context: A089844 A113997 A125789 this_sequence A144309 A080376 A005669
Adjacent sequences: A058728 A058729 A058730 this_sequence A058732 A058733 A058734
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 31 2000; May 28 2006
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EXTENSIONS
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Definition corrected by Gordon Royle, Feb 13 2007
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