id:A118408 - OEIS Search Results

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Row sums of triangle A118407.

+0
3

1, 1, -1, 1, 1, -1, 3, -3, 1, 7, -13, 13, 1, -25, 51, -51, 1, 103, -205, 205, 1, -409, 819, -819, 1, 1639, -3277, 3277, 1, -6553, 13107, -13107, 1, 26215, -52429, 52429, 1, -104857, 209715, -209715, 1, 419431, -838861, 838861, 1, -1677721, 3355443, -3355443, 1, 6710887, -13421773, 13421773, 1 (list; graph; listen)

	OFFSET	`0,7`
	FORMULA	`G.f.: (1+x)^2/(1+x^2)/(1+2x+2x^2)/(1-x).`
	PROGRAM	`(PARI) {a(n)=polcoeff((1+x)^2/(1+x^2)/(1+2x+2x^2)/(1-x+x*O(x^n)), n)}`
	CROSSREFS	`Cf. A118407 (triangle), A118409 (unsigned row sums).` `Sequence in context: A106479 A114422 A127501 this_sequence A079268 A102316 A133709` `Adjacent sequences: A118405 A118406 A118407 this_sequence A118409 A118410 A118411`
	KEYWORD	`sign`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Apr 27 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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