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Search: id:A130550
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A130550 Denominators of partial sums for a series for 2*Zeta(2)/3 = (Pi^2)/9. +0
2
1, 12, 180, 1008, 8400, 118800, 75675600, 302702400, 15437822400, 26665329600, 3226504881600, 5708431713600, 964724959598400, 964724959598400, 46628373047256000, 340112838697632000, 98292610383615648000 (list; graph; listen)
OFFSET

1,2

COMMENT

Numerators are given in A130549.

For the rationals r(n):= 2*sum(1/(j^2*binomial(2*j,j)),j=1..n), n>=1, the van der Poorten reference and a W. Lang link see A130551.

FORMULA

a(n)=denominator(r(n)), n>=1.

CROSSREFS

Sequence in context: A099930 A052208 A045952 this_sequence A073975 A069685 A000515

Adjacent sequences: A130547 A130548 A130549 this_sequence A130551 A130552 A130553

KEYWORD

nonn,frac,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Jul 13 2007

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.


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