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Search: id:A123401
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| A123401 |
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Number of maximal chains in the Stanley lattice of order n. |
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+0
1
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| 1, 1, 1, 18, 32400, 17146080000, 5838929512416000000, 2371384771694500507545600000000, 1912347371757319698802901729638809600000000000, 4729554291048229774403876712233157022270603395072000000000000000, 52408889027141714669562863434538278134100104813558451332105036103680000000000000\ 000000
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OFFSET
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0,4
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REFERENCES
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D. E. Knuth, TAOCP, Section 7.2.1.6, Problem 34.
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FORMULA
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(n*(n-1)/2)! * Product( (2*i-1)^(n-i),i=1..n-1).
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MAPLE
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f:=n-> (n*(n-1)/2)! * mul( (2*i-1)^(n-i), i=1..n-1);
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CROSSREFS
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Sequence in context: A060617 A153301 A129042 this_sequence A079303 A159445 A146548
Adjacent sequences: A123398 A123399 A123400 this_sequence A123402 A123403 A123404
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Oct 15 2006
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