id:A130546 - OEIS Search Results

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Denominators of 2*sum(1/binomial(2*k,k),k=1..n), n>=1.

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2

1, 3, 30, 210, 315, 6930, 16380, 60060, 1021020, 19399380, 461890, 37182145, 106234700, 75482550, 166363540200, 5157269746200, 1719089915400, 12033629407800, 445244288088600, 445244288088600, 588871477794600 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Numerators are given by A130545.` `For the rationals r(n):= 2sum(1/binomial(2k,k),k=1..n), n>=1, the Comtet reference and a W. Lang link see A130545.`
	FORMULA	`a(n)=denom(r(n)), n>=1.`
	CROSSREFS	`Sequence in context: A032263 A003771 A121100 this_sequence A051133 A043030 A120689` `Adjacent sequences: A130543 A130544 A130545 this_sequence A130547 A130548 A130549`
	KEYWORD	`nonn,frac,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Jul 13 2007`

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Last modified December 2 15:58 EST 2008. Contains 150992 sequences.

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