

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
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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



