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Search: id:A058669
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| A058669 |
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Triangle T(n,k) read by rows, giving number of matroids of rank k on n labeled points (n >= 0, 0<=k<=n). |
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5
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| 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)
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OFFSET
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0,5
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LINKS
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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
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EXAMPLE
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1; 1,1; 1,3,1; 1,7,7,1; ...
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CROSSREFS
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Row sums give A058673. Diagonals give A058681, A058687. Cf. A053534.
Sequence in context: A046802 A022166 A141689 this_sequence A057004 A059328 A075440
Adjacent sequences: A058666 A058667 A058668 this_sequence A058670 A058671 A058672
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KEYWORD
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nonn,nice,tabl,more
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 30 2000
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