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Search: id:A130548
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| A130548 |
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Denominators of 6*(sum(1/binomial(2*k,k),k=1..n)-1/3), n>=1. |
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+0
3
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| 1, 1, 10, 70, 105, 2310, 5460, 20020, 340340, 6466460, 461890, 37182145, 106234700, 25160850, 55454513400, 1719089915400, 573029971800, 4011209802600, 148414762696200, 148414762696200, 196290492598200, 261655226633400600
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OFFSET
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1,3
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COMMENT
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Numerators are given by A130547.
For the rationals r(n):= 6*(sum(1/binomial(2*k,k),k=1..n)-1/3), n>=1, the Comtet reference and a W. Lang link see A130547.
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FORMULA
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a(n)=denominator(r(n)), n>=1.
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CROSSREFS
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Sequence in context: A038806 A016273 A128737 this_sequence A090084 A025221 A005567
Adjacent sequences: A130545 A130546 A130547 this_sequence A130549 A130550 A130551
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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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