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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 FORMULA abs(a(n))=A035263(n) CROSSREFS Cf. A001511, A035263. Sequence in context: A141260 A029883 A035263 * A259599 A070749 A285341 Adjacent sequences:  A089042 A089043 A089044 * A089046 A089047 A089048 KEYWORD sign AUTHOR Benoit Cloitre, Dec 02 2003 STATUS approved

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Last modified July 15 20:00 EDT 2019. Contains 325056 sequences. (Running on oeis4.)