id:A117259 - OEIS Search Results

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Column 0 of triangle A117258.

+0
2

1, 1, -2, 32, -2560, 917504, -1409286144, 9070970929152, -241505530017742848, 26378844025404658810880, -11755594669932654094842855424, 21291459481433341027538627037495296, -156279993920424129009046403691280672489472 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = [prod_{j=0..n-1} (1-2j)]/n! 4^(n*(n-1)/2).`
	PROGRAM	`(PARI) {a(n)=local(m=1, p=2, q=4, r=1); prod(j=0, n-1, mr-pj)/n!q^(n(n-1)/2)}`
	CROSSREFS	`Sequence in context: A087084 A088386 A093584 this_sequence A068183 A166077 A053853` `Adjacent sequences: A117256 A117257 A117258 this_sequence A117260 A117261 A117262`
	KEYWORD	`sign`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 14 2006`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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