A130034 - OEIS

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A130034

Denominators of partial sums of a series for the inverse of the arithmetic-geometric mean (agM) of 1 and sqrt(2)/2.

1, 8, 256, 2048, 262144, 2097152, 67108864, 536870912, 274877906944, 2199023255552, 70368744177664, 562949953421312, 72057594037927936, 576460752303423488, 18446744073709551616, 147573952589676412928 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`See the references and the W. Lang link under A129934.`
	FORMULA	`a(n) = denom(sum((((2j)!/(j!^2))^2)(1/2^(5*j)),j=0..n)), n>=0.`
	CROSSREFS	`Sequence in context: A171612 A053717 A034674 * A128787 A013824 A010044` `Adjacent sequences: A130031 A130032 A130033 * A130035 A130036 A130037`
	KEYWORD	`nonn,frac,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Jun 01 2007`

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.