A158496 - OEIS

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A158496

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

1, -4, -1, 8, 1, -12, -1, 16, 1, -20, -1, 24, 1, -28, -1, 32, 1, -36, -1, 40, 1, -44, -1, 48, 1, -52, -1, 56, 1, -60, -1, 64, 1, -68, -1, 72, 1, -76, -1, 80, 1, -84, -1, 88, 1, -92, -1, 96, 1, -100, -1, 104, 1, -108, -1, 112, 1, -116, -1, 120, 1, -124, -1, 128, 1, -132, -1 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Hankel transform of A158495.`
	FORMULA	`a(n)=((n+3/2-(n+1/2)(-1)^n)(-1)^C(n+1,2).`
	CROSSREFS	`Cf. A019425.` `Sequence in context: A179836 A040019 A019768 * A019425 A080102 A106475` `Adjacent sequences: A158493 A158494 A158495 * A158497 A158498 A158499`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 20 2009`

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Last modified February 15 20:26 EST 2012. Contains 205852 sequences.