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 A124079 a(n) = H(2n+1)*(2n+1)!/n!, where H(n) = Sum_{k=1..n} 1/k, the n-th harmonic number. 2
 1, 11, 137, 2178, 42774, 1004532, 27503832, 860945040, 30342400560, 1189277851680, 51324077044800, 2418504655996800, 123569793528249600, 6804789307610918400, 401797276566253747200, 25323878997135577958400 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS 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, Nov 28 2006 MATHEMATICA f[n_] := HarmonicNumber[2n + 1](2n + 1)!/n!; Table[f@n, {n, 0, 15}] (* Robert G. Wilson v, Nov 26 2006 *) CROSSREFS Cf. A123989, A124078. Sequence in context: A142895 A232180 A201111 * A174289 A003378 A142930 Adjacent sequences:  A124076 A124077 A124078 * A124080 A124081 A124082 KEYWORD easy,nonn AUTHOR Leroy Quet, Nov 24 2006 EXTENSIONS More terms from Robert G. Wilson v, Nov 26 2006 More terms from Emeric Deutsch, Nov 28 2006 STATUS approved

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Last modified May 7 22:52 EDT 2021. Contains 343652 sequences. (Running on oeis4.)