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 A133131 a(4n) = 3n+1, a(4n+1) = -3n, a(4n+2) = -3n-3, a(4n+3) = 3n+2 . 0
 1, 0, -3, 2, 4, -3, -6, 5, 7, -6, -9, 8, 10, -9, -12, 11, 13, -12, -15, 14, 16, -15, -18, 17, 19, -18, -21, 20, 22, -21, -24, 23, 25, -24, -27, 26, 28, -27, -30, 29, 31, -30, -33, 32, 34, -33, -36, 35, 37, -36, -39, 38, 40, -39, -42, 41, 43, -42, -45, 44, 46, -45, -48, 47, 49, -48, -51, 50, 52, -51, -54, 53, 55, -54, -57, 56 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Second differences of 0, 0, 1, 2, 0, 0, 3, 4 .. . LINKS FORMULA G.f.:(1+x^4+x^3-x^2+x)/((x+1)*(x^2+1)^2) [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009] CROSSREFS Sequence in context: A243852 A025532 A195459 * A261985 A026923 A058708 Adjacent sequences:  A133128 A133129 A133130 * A133132 A133133 A133134 KEYWORD sign AUTHOR Paul Curtz, Sep 20 2007 STATUS approved

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Last modified January 16 15:53 EST 2019. Contains 319195 sequences. (Running on oeis4.)