id:A117257 - OEIS Search Results

Search: id:A117257

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Column 0 of triangle A117256.

+0
2

1, 1, -10, 750, -328125, 779296875, -9741210937500, 630569458007812500, -209368765354156494140625, 354400253854691982269287109375, -3045627181563759222626686096191406250, 132489108572997338342247530817985534667968750 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = [prod_{j=0..n-1} (1-5j)]/n! 5^(n*(n-1)/2).`
	PROGRAM	`(PARI) {a(n)=local(m=1, p=5, q=5, r=1); prod(j=0, n-1, mr-pj)/n!q^(n(n-1)/2)}`
	CROSSREFS	`Sequence in context: A053468 A008272 A015509 this_sequence A030979 A108247 A108243` `Adjacent sequences: A117254 A117255 A117256 this_sequence A117258 A117259 A117260`
	KEYWORD	`sign`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 14 2006`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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