A128492 - OEIS

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A128492

Denominators of partial sums for a series for (Pi^2)/8.

1, 9, 225, 11025, 99225, 12006225, 2029052025, 405810405, 117279207045, 42337793743245, 42337793743245, 22396692890176605, 2799586611272075625, 25196279501448680625, 21190071060718340405625 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Numerators are given in A120268.` `See the comments and the W. Lang link under A120268.`
	FORMULA	`a(n)=denominator(r(n)) with r(n):=sum(1/(2*k-1)^2,k=1..n).`
	CROSSREFS	`Sequence in context: A012749 A188662 A079727 * A001818 A095363 A138564` `Adjacent sequences: A128489 A128490 A128491 * A128493 A128494 A128495`
	KEYWORD	`nonn,frac,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Apr 04 2007`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.