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Search: id:A055545
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| A055545 |
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Number of matroids on n points. |
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+0
4
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OFFSET
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0,2
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COMMENT
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This is the total number of pairwise non-isomorphic (i.e. "unlabeled") matroids on n points, with no restrictions on loops, parallel elements etc.
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REFERENCES
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Oxley, J. G., Matroid Theory. Oxford, England: Oxford University Press, 1993.
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LINKS
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Gordon Royle and Dillon Mayhew, 9-element matroids
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to matroids
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CROSSREFS
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Cf. A002773.
Adjacent sequences: A055542 A055543 A055544 this_sequence A055546 A055547 A055548
Sequence in context: A118928 A049312 A132043 this_sequence A036375 A036376 A000598
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KEYWORD
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nonn,nice
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
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a(9) from Gordon Royle, Dec 23 2006
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