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Search: id:A114450
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| A114450 |
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a(n)=(2n)!*(sum{k=1...2n}1/k)/(2n+1). |
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+0
2
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| 0, 1, 10, 252, 12176, 966240, 114341760, 18897709824, 4160840140800, 1177736213606400, 416807049369600000, 180368555623280640000, 93711488655948742656000, 57572391079539343687680000
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Every term is an integer.
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FORMULA
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a(n) = A000254(2n)/(2n+1)
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MAPLE
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seq((2*n)!*(sum(1/k, k=1..2*n))/(2*n+1), n=0..15); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 15 2006
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CROSSREFS
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Cf. A000254.
Sequence in context: A128013 A134262 A001536 this_sequence A095983 A059166 A100743
Adjacent sequences: A114447 A114448 A114449 this_sequence A114451 A114452 A114453
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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), Feb 14 2006
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 15 2006
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