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A133131
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a(4n) = 3n+1, a(4n+1) = -3n, a(4n+2) = -3n-3, a(4n+3) = 3n+2 .
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0
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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; internal format)
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OFFSET
| 0,3
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COMMENTS
| Second differences of 0, 0, 1, 2, 0, 0, 3, 4 .. .
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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]
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CROSSREFS
| Sequence in context: A140114 A025532 A195459 * A026923 A058708 A141731
Adjacent sequences: A133128 A133129 A133130 * A133132 A133133 A133134
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KEYWORD
| sign
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Sep 20 2007
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