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Search: id:A130417
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| A130417 |
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Denominator of partial sums for a series of (17/18)*Zeta(4)= (17/1680)*Pi^4. |
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+0
2
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| 1, 48, 6480, 725760, 12960000, 2993760000, 13349175840000, 213586813440000, 98036347368960000, 1862690600010240000, 2479241188613629440000, 57022547338113477120000, 125278536501835309232640000
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OFFSET
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1,2
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COMMENT
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Numerators are given by A130416.
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REFERENCES
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For the rationals r(n), a reference and a W. Lang link see A130416.
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FORMULA
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a(n)=denominator(r(n)), n>=1, with r(n):=2*sum(1/((k^4)*binomial(2*k,k)),k=1..n).
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CROSSREFS
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Sequence in context: A098209 A114721 A057868 this_sequence A123478 A011787 A006070
Adjacent sequences: A130414 A130415 A130416 this_sequence A130418 A130419 A130420
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KEYWORD
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nonn,frac,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Jul 13 2007
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