A058687 Number of matroids of rank 3 on n labeled points.

1, 15, 171, 2053, 33442, 1022217

Offset

3,2

Links

Table of n, a(n) for n=3..8.

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.

Index entries for sequences related to matroids

Crossrefs

Column k=3 of A058669.

Sequence in context: A206600 A016172 A016225 * A206594 A354403 A152586

Adjacent sequences: A058684 A058685 A058686 * A058688 A058689 A058690

Keyword

nonn

Author

N. J. A. Sloane, Dec 30 2000

Status

approved