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Search: id:A025535
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| A025535 |
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a(n) = (1/C(2n,0) - 1/C(2n,1) + ... + d/C(2n,2n))*L, where d = (-1)^2n, L = LCM{C(2n,0), C(2n,1),..., C(2n,2n)}. |
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+0
1
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| 1, 3, 20, 105, 504, 4620, 51480, 45045, 1361360, 23279256, 21162960, 446185740, 2059318800, 5736673800, 155272637520, 4512611027925, 8494326640800, 8022419605200, 281206918792800, 267146572853160, 10431437606647200
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = LCM{n+1, n+2, ..., 2*n+1}/(n+1). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Oct 11 2002
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CROSSREFS
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Sequence in context: A000948 A074831 A000917 this_sequence A119693 A139471 A108911
Adjacent sequences: A025532 A025533 A025534 this_sequence A025536 A025537 A025538
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KEYWORD
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nonn,easy
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), May 05 2000
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