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Search: id:A058692
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| 1, 4, 14, 51, 202, 876, 4139, 21146, 115974, 678569, 4213596, 27644436, 190899321, 1382958544, 10480142146, 82864869803, 682076806158, 5832742205056, 51724158235371, 474869816156750, 4506715738447322, 44152005855084345
(list; graph; listen)
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OFFSET
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2,2
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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.
W. M. B. Dukes, On the number of matroids on a finite set
Index entries for sequences related to matroids
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MAPLE
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a:=n->sum(stirling2(n, k), k=2..n): seq(a(n), n=2..23); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 28 2007
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MATHEMATICA
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f[n_] := Sum[ StirlingS2[n, k], {k, 2, n}]; Table[ f[n], {n, 2, 23}] - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 29 2007
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CROSSREFS
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A diagonal of A058710.
Adjacent sequences: A058689 A058690 A058691 this_sequence A058693 A058694 A058695
Sequence in context: A117421 A034743 A096241 this_sequence A099486 A047033 A017947
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KEYWORD
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nonn
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AUTHOR
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njas, Dec 30 2000
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