id:A109963 - OEIS Search Results

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Diagonal sums of number triangle A109962.

+0
2

1, -1, 5, -27, 171, -1178, 8582, -65029, 507317, -4047608, 32874104, -270893586, 2259210814, -19032956491, 161735556091, -1384662302187, 11931865642979, -103409449621325, 900778907303037, -7882176975668156, 69253864680597564, -610717827031587856 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`G.f.: g/(1-f) where f/(1-f)^4=x and g=1/(1-f); a(n)=(-1)^nsum{k=0..floor(n/2), ((4k+1)/(3n-2k+1))binomial(4n-4k, n-2k)}.`
	CROSSREFS	`Adjacent sequences: A109960 A109961 A109962 this_sequence A109964 A109965 A109966` `Sequence in context: A062512 A138772 A082425 this_sequence A091101 A134703 A023811`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 06 2005`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

AT&T Labs Research