id:A123989 - OEIS Search Results

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a(n) = H(2n)*(2n)!/n! where H(n) = sum{k=1 to n} 1/k, the n-th harmonic number.

+0
3

0, 3, 25, 294, 4566, 88572, 2064504, 56243184, 1754322480, 61664980320, 2412077832000, 103928089910400, 4890979939104000, 249630539076979200, 13734482066534476800, 810355993296898406400, 51040766703826377676800 (list; graph; listen)

	OFFSET	`0,2`
	MATHEMATICA	`f[n_] := HarmonicNumber[2n](2n)!/n!; Table[f@n, {n, 0, 16}] - Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 26 2006`
	CROSSREFS	`Cf. A124078, A124079.` `Sequence in context: A080896 A126746 A118989 this_sequence A001907 A143635 A023997` `Adjacent sequences: A123986 A123987 A123988 this_sequence A123990 A123991 A123992`
	KEYWORD	`easy,nonn`
	AUTHOR	`Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Nov 23 2006`
	EXTENSIONS	`More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 26 2006`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

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