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A114450 a(n)=(2n)!*(sum{k=1...2n}1/k)/(2n+1). 1
0, 1, 10, 252, 12176, 966240, 114341760, 18897709824, 4160840140800, 1177736213606400, 416807049369600000, 180368555623280640000, 93711488655948742656000, 57572391079539343687680000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Every term is an integer.

LINKS

Table of n, a(n) for n=0..13.

FORMULA

a(n) = A000254(2n)/(2n+1)

MAPLE

seq((2*n)!*(sum(1/k, k=1..2*n))/(2*n+1), n=0..15); - Emeric Deutsch, May 15 2006

MATHEMATICA

Table[(2n)! Sum[1/k, {k, 2n}]/(2n+1), {n, 0, 20}] (* Harvey P. Dale, Aug 27 2012 *)

CROSSREFS

Cf. A000254.

Sequence in context: A134262 A240289 A001536 * A178689 A095983 A059166

Adjacent sequences:  A114447 A114448 A114449 * A114451 A114452 A114453

KEYWORD

nonn

AUTHOR

Leroy Quet, Feb 14 2006

EXTENSIONS

More terms from Emeric Deutsch, May 15 2006

STATUS

approved

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Last modified March 23 22:30 EDT 2017. Contains 283985 sequences.