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A058693 Number of nonisomorphic matroids of rank 3 on n labeled points. 2
1, 4, 13, 38, 108, 325, 1275, 10037, 298491 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..11.

W. M. B. Dukes, Tables of matroids.

W. M. B. Dukes, Counting and Probability in Matroid Theory, Ph.D. Thesis, Trinity College, Dublin, 2000.

W. M. B. Dukes, The number of matroids on a finite set, arXiv:math/0411557 [math.CO], 2004.

W. M. B. Dukes, On the number of matroids on a finite set, Séminaire Lotharingien de Combinatoire 51 (2004), Article B51g.

Dillon Mayhew and Gordon F. Royle, Matroids with nine elements, arXiv:math/0702316 [math.CO], 2007 (see p. 7).

Dillon Mayhew and Gordon F. Royle, Matroids with nine elements, J. Combin. Theory Ser. B 98(2) (2008), 415-431.

Index entries for sequences related to matroids

CROSSREFS

Column k=3 of A053534.

Sequence in context: A056014 A247287 A159036 * A027076 A183112 A266429

Adjacent sequences:  A058690 A058691 A058692 * A058694 A058695 A058696

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 30 2000

EXTENSIONS

a(9) from Petros Hadjicostas, Oct 10 2019 using the papers of Mayhew and Royle

a(10)-a(11) from Manfred Scheucher, Sep 02 2020

STATUS

approved

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Last modified December 4 11:35 EST 2020. Contains 338923 sequences. (Running on oeis4.)