A120796 - OEIS

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A120796

Denominators of partial sums of Catalan numbers scaled by powers of -1/20.

1, 20, 200, 1600, 80000, 1600000, 16000000, 1280000000, 512000000, 256000000000, 2560000000000, 102400000000000, 1024000000000000, 4096000000000000, 40960000000000000, 6553600000000000000 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Numerators are given under A120791.`
	FORMULA	`a(n)=denominator(r(n)), with the rationals r(n):=sum(((-1)^k)*C(k)/20^k,k=0..n) with C(k):=A000108(k) (Catalan numbers). Rationals r(n) are taken in lowest terms.`
	CROSSREFS	`Sequence in context: A045758 A035474 A103261 * A120787 A099197 A041766` `Adjacent sequences: A120793 A120794 A120795 * A120797 A120798 A120799`
	KEYWORD	`nonn,easy,frac`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Jul 20 2006`

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Last modified February 14 01:34 EST 2012. Contains 205567 sequences.