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A058669 Triangle T(n,k) giving number of matroids of rank k on n labeled points (n >= 0, 0<=k<=n). +0
5
1, 1, 1, 1, 3, 1, 1, 7, 7, 1, 1, 15, 36, 15, 1, 1, 31, 171, 171, 31, 1, 1, 63, 813, 2053, 813, 63, 1, 1, 127, 4012, 33442, 33442, 4012, 127, 1, 1, 255, 20891, 1022217, 8520812, 1022217, 20891, 255, 1, 1, 511 (list; table; graph; listen)
OFFSET

0,5

LINKS

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

W. M. B. Dukes, On the number of matroids on a finite set

EXAMPLE

1; 1,1; 1,3,1; 1,7,7,1; ...

CROSSREFS

Row sums give A058673. Diagonals give A058681, A058687. Cf. A053534.

Adjacent sequences: A058666 A058667 A058668 this_sequence A058670 A058671 A058672

Sequence in context: A136126 A046802 A022166 this_sequence A057004 A059328 A075440

KEYWORD

nonn,nice,tabl

AUTHOR

njas, Dec 30 2000

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.


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