id:A127896 - OEIS Search Results

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Expansion of 1/(1+2x+3x^2+x^3).

+0
3

1, -2, 1, 3, -7, 4, 10, -25, 16, 33, -89, 63, 108, -316, 245, 350, -1119, 943, 1121, -3952, 3598, 3539, -13920, 13625, 10971, -48897, 51256, 33208, -171287, 191694, 97265, -598325, 713161, 271388, -2083934 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sums of A127895. Series reversion is A127897.`
	FORMULA	`a(n)=sum{k=0..n, (-1)^(n-k)*C(n+2k+2,n-k)}`
	CROSSREFS	`Sequence in context: A116381 A073901 A058170 this_sequence A010757 A019320 A033640` `Adjacent sequences: A127893 A127894 A127895 this_sequence A127897 A127898 A127899`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 04 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research