login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A058718 Number of nonisomorphic loopless matroids on n unlabeled points. 3
1, 1, 2, 4, 9, 21, 60, 208, 1418, 381448 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..9.

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.

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

Gordon Royle and Dillon Mayhew, 9-element matroids.

Index entries for sequences related to matroids

CROSSREFS

Row sums of A058716.

Sequence in context: A123458 A048194 A148075 * A148076 A217976 A156801

Adjacent sequences:  A058715 A058716 A058717 * A058719 A058720 A058721

KEYWORD

nonn,nice,more

AUTHOR

N. J. A. Sloane, Dec 31 2000

EXTENSIONS

a(9) from Gordon Royle, Dec 23 2006

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 19 22:04 EST 2020. Contains 332060 sequences. (Running on oeis4.)