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 A309970 Period 12: repeat [1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1]. 0
 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0 LINKS Index entries for linear recurrences with constant coefficients, signature (0,1,0,-1). FORMULA a(n) = H(floor((n + 4)/2), 1, 1/2) where H(n, a, b) = hypergeom([a - n/2, b - n/2], [1 - n], 4). From Chai Wah Wu, Feb 16 2021: (Start) a(n) = a(n-2) - a(n-4) for n > 3. G.f.: (1 - x)*(x + 1)^2/(x^4 - x^2 + 1). (End) PROG (Magma) &cat [[1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1]^^10] CROSSREFS Sequence in context: A188192 A068432 A134668 * A039963 A267537 A329670 Adjacent sequences:  A309967 A309968 A309969 * A309971 A309972 A309973 KEYWORD sign AUTHOR Peter Luschny, Sep 03 2019 STATUS approved

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Last modified June 14 10:04 EDT 2021. Contains 345025 sequences. (Running on oeis4.)