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A124079
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a(n) = H(2n+1)*(2n+1)!/n!, where H(n) = sum{k=1 to n} 1/k, the n-th harmonic number.
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2
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1, 11, 137, 2178, 42774, 1004532, 27503832, 860945040, 30342400560, 1189277851680, 51324077044800, 2418504655996800, 123569793528249600, 6804789307610918400, 401797276566253747200, 25323878997135577958400
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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MAPLE
| H:=n->sum(1/k, k=1..n): a:=n->(2*n+1)!*H(2*n+1)/n!: seq(a(n), n=0..17); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 28 2006
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MATHEMATICA
| f[n_] := HarmonicNumber[2n + 1](2n + 1)!/n!; Table[f@n, {n, 0, 15}] - Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 26 2006
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CROSSREFS
| Cf. A123989, A124078.
Sequence in context: A123800 A142895 A201111 * A174289 A003378 A142930
Adjacent sequences: A124076 A124077 A124078 * A124080 A124081 A124082
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KEYWORD
| easy,nonn
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AUTHOR
| Leroy Quet Nov 24 2006
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 26 2006
More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 28 2006
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