A112690 - OEIS

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A112690

Expansion of 1/(1+x^2-x^3-x^5).

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

	OFFSET	`0,1`
	COMMENTS	`Partial sums are A112689.`
	FORMULA	`G.f.: 1/((1+x^2)(1-x^3)); a(n)=sum{k=0..n, sum{j=0..floor((k+1)/2)), (-1)^(k-j)*C(k-j+1, j-1)}}.` `a(n+12) = a(n) = 1/6 + A057077(n+1)/2 + A061347(n+1)/3. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 23 2009]`
	CROSSREFS	`Sequence in context: A157412 A023532 A030308 * A115971 A072165 A072608` `Adjacent sequences: A112687 A112688 A112689 * A112691 A112692 A112693`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 15 2005`

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Last modified February 14 13:08 EST 2012. Contains 205623 sequences.