A105812 - OEIS

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A105812

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

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

	OFFSET	`0,1`
	COMMENTS	`Row sums of number triangle A105810.`
	FORMULA	`a(n)=-(-1)^n-binomial(1, n)+3*binomial(0, n)` `a(n)=A033999(n-1), n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 28 2008]`
	CROSSREFS	`Cf. A060576.` `Sequence in context: A176412 A013596 A131695 * A134323 A060576 A019590` `Adjacent sequences: A105809 A105810 A105811 * A105813 A105814 A105815`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 04 2005`

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Last modified February 15 02:50 EST 2012. Contains 205694 sequences.