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A058711 Triangle T(n,k) giving number of loopless matroids of rank k on n labeled points (n >= 1, 1<=k<=n). 3
1, 1, 1, 1, 4, 1, 1, 14, 11, 1, 1, 31, 106, 21, 1, 1, 202, 1232, 642, 57, 1, 1, 876, 22172, 28367, 3592, 120, 1, 1, 4139, 686515, 8274374, 991829, 19904, 247, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..36.

W. M. B. Dukes, Tables of matroids

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

Index entries for sequences related to matroids

EXAMPLE

1; 1,1; 1,4,1; 1,14,11,1; ...

CROSSREFS

Cf. A058710. Row sums give A058712. Diagonals give A058692, A058715.

Sequence in context: A267318 A050154 A179454 * A202906 A177984 A157013

Adjacent sequences:  A058708 A058709 A058710 * A058712 A058713 A058714

KEYWORD

nonn,nice,tabl

AUTHOR

N. J. A. Sloane, Dec 31 2000

STATUS

approved

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Last modified October 15 21:06 EDT 2018. Contains 316237 sequences. (Running on oeis4.)