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A089045 a(1)=1 and a(n)=a(n-1)+(-1)^floor(n/2)*a(floor(n/2)). 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, 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; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..110.

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, Dec 02 2003

STATUS

approved

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Last modified May 26 21:55 EDT 2018. Contains 304645 sequences. (Running on oeis4.)