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 A123401 Number of maximal chains in the Stanley lattice of order n. 0
 1, 1, 1, 18, 32400, 17146080000, 5838929512416000000, 2371384771694500507545600000000, 1912347371757319698802901729638809600000000000, 4729554291048229774403876712233157022270603395072000000000000000, 52408889027141714669562863434538278134100104813558451332105036103680000000000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 REFERENCES D. E. Knuth, TAOCP, Section 7.2.1.6, Problem 34. LINKS Table of n, a(n) for n=0..10. FORMULA (n*(n-1)/2)! * Product( (2*i-1)^(n-i),i=1..n-1). MAPLE f:=n-> (n*(n-1)/2)! * mul( (2*i-1)^(n-i), i=1..n-1); CROSSREFS Sequence in context: A202155 A296653 A255406 * A201494 A079303 A159445 Adjacent sequences: A123398 A123399 A123400 * A123402 A123403 A123404 KEYWORD nonn AUTHOR N. J. A. Sloane, Oct 15 2006 STATUS approved

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Last modified September 17 05:28 EDT 2024. Contains 375985 sequences. (Running on oeis4.)