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Search: id:A109780
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| A109780 |
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n! sum{k=1 to n} H(k) (n-k)!, where H(k) = sum{j=1 to k} 1/j. |
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+0
2
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| 1, 5, 32, 310, 4924, 126648, 4869192, 258608880, 17973530784, 1576566817920, 170028329630400, 22092970356011520, 3402396234446595840, 612619882946124157440, 127484451712085785228800, 30358069092698014483200000
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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E.g.f.: hypergeom([1, 1], [], x)*ln(1-x)/(x-1). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Aug 16 2005
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MATHEMATICA
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f[n_] := n! * Sum[(n-k)! * Sum[1/j, {j, 1, k}], {k, 1, n}]; Table[f[n], {n, 1, 30}] (Propper)
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CROSSREFS
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Sequence in context: A023880 A104031 A023882 this_sequence A093448 A094653 A135250
Adjacent sequences: A109777 A109778 A109779 this_sequence A109781 A109782 A109783
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Aug 13 2005
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EXTENSIONS
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More terms from Ryan Propper (rpropper(AT)stanford.edu), Aug 18 2005
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