id:A117253 - OEIS Search Results

Search: id:A117253

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Column 0 of triangle A117252.

+0
2

1, 1, -3, 45, -2430, 433026, -245525742, 434685788658, -2376644549487615, 39849199161258840705, -2039314646436750180150939, 317469566015078743658568283029, -149970083228995077874358388356635368, 214577598849654850870918566871719460091160 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = [prod_{j=0..n-1} (1-3j)]/n! 3^(n*(n-1)/2).`
	PROGRAM	`(PARI) a(n)=prod(j=0, n-1, 1-3j)/n!3^(n*(n-1)/2)`
	CROSSREFS	`Sequence in context: A012494 A012780 A072503 this_sequence A012833 A012747 A027637` `Adjacent sequences: A117250 A117251 A117252 this_sequence A117254 A117255 A117256`
	KEYWORD	`sign`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 14 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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