A089045 - OEIS

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A089045

a(1)=1 and a(n)=a(n-1)+(-1)^floor(n/2)*a(floor(n/2)).

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

	OFFSET	`1,1`
	FORMULA	`abs(a(n))=A035263(n)`
	CROSSREFS	`Cf. A001511, A035263.` `Sequence in context: A141260 A029883 A035263 * A070749 A059778 A104521` `Adjacent sequences: A089042 A089043 A089044 * A089046 A089047 A089048`
	KEYWORD	`sign`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 02 2003`

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Last modified February 15 11:03 EST 2012. Contains 205763 sequences.