A112553 - OEIS

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A112553

Expansion of 1/(1-x+2x^2-x^3+x^4).

1, 1, -1, -2, 0, 2, 1, -1, -1, 0, 0, 0, 1, 1, -1, -2, 0, 2, 1, -1, -1, 0, 0, 0, 1, 1, -1, -2, 0, 2, 1, -1, -1, 0, 0, 0, 1, 1, -1, -2, 0, 2, 1, -1, -1, 0, 0, 0, 1, 1, -1, -2, 0, 2, 1, -1, -1, 0, 0, 0, 1, 1, -1, -2, 0, 2, 1, -1, -1, 0, 0, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	COMMENTS	`Row sums of A112552.`
	FORMULA	`a(n)=sum{k=0..n, (-1)^(n-k)*sum{j=0..n, (1+(-1)^(n-j))(1+(-1)^(j-k))C((j+k)/2, k)/4}}`
	CROSSREFS	`Sequence in context: A102442 A091182 A001822 * A026610 A094451 A056562` `Adjacent sequences: A112550 A112551 A112552 * A112554 A112555 A112556`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 13 2005`

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Last modified February 15 18:55 EST 2012. Contains 205847 sequences.