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Search: id:A132043
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| A132043 |
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Number of bitransversal (transversal and dual transversal) matroids on n unlabeled elements. |
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+0
1
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OFFSET
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1,1
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COMMENT
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A transversal matroid is a matroid whose independent sets are the partial transversals of a family of subsets of [1..n], while a bitransversal matroid is a transversal matroid whose dual is transversal. The principal (or fundamental) transversal matroids enumerated by A049312 form an important subset of bitransversal matroids.
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REFERENCES
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Jensen, P. M., Binary fundamental matroids. Algebraic methods in graph theory, Vol. I, II (Szeged, 1978), pp. 281-296, Colloq. Math. Soc. Janos Bolyai, 25, North-Holland, Amsterdam-New York, 1981
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CROSSREFS
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Cf. A049312.
Sequence in context: A101516 A118928 A049312 this_sequence A055545 A036375 A036376
Adjacent sequences: A132040 A132041 A132042 this_sequence A132044 A132045 A132046
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KEYWORD
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nonn
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AUTHOR
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Gordon Royle (gordon(AT)csse.uwa.edu.au), Oct 30 2007
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