id:A128214 - OEIS Search Results

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

+0
2

1, 0, 0, -2, 3, 0, -5, 6, 0, -8, 9, 0, -11, 12, 0, -14, 15, 0, -17, 18, 0, -20, 21, 0, -23, 24, 0, -26, 27, 0, -29, 30, 0, -32, 33, 0, -35, 36, 0, -38, 39, 0, -41, 42, 0, -44, 45, 0, -47, 48, 0, -50, 51, 0, -53, 54 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Binomial transform is A128213.`
	FORMULA	`a(n)=(1-n)cos(2pin/3)+(n-1)sin(2pi*n/3)/sqrt(3)`
	CROSSREFS	`Sequence in context: A167485 A140508 A063956 this_sequence A145105 A140700 A055615` `Adjacent sequences: A128211 A128212 A128213 this_sequence A128215 A128216 A128217`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 19 2007`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

AT&T Labs Research