id:A117251 - OEIS Search Results

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Column 0 of triangle A117250.

+0
2

1, 1, -1, 4, -40, 896, -43008, 4325376, -899678208, 383862702080, -334114095890432, 590956713604022272, -2117988861556815822848, 15348576513041885002989568, -224527747847927003472304537600, 6621592717332784844802427579269120 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`a(n) = (-1)^(n-1) * C(2n,n)/(2n-1) * 2^((n-1)*(n-2)/2-1).`
	PROGRAM	`(PARI) a(n)=(-1)^(n-1)2^((n-1)(n-2)/2-1)binomial(2n, n)/(2*n-1)`
	CROSSREFS	`Sequence in context: A121276 A013053 A055128 this_sequence A012957 A012977 A013108` `Adjacent sequences: A117248 A117249 A117250 this_sequence A117252 A117253 A117254`
	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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