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Search: id:A158926
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| 0, 0, 0, -9, 27, -54, 99, -189, 378, -765, 1539, -3078, 6147, -12285, 24570, -49149, 98307, -196614, 393219, -786429, 1572858, -3145725, 6291459, -12582918, 25165827, -50331645, 100663290, -201326589, 402653187, -805306374, 1610612739, -3221225469, 6442450938
(list; graph; listen)
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OFFSET
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0,4
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FORMULA
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a(n) = -3a(n-1)-3a(n-2)-2a(n-3), n > 3.
a(n) = 9*(-1)^n*A024495(n+1) .
G.f.: -9*x^3/((2*x+1)*(1+x+x^2)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 08 2009
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CROSSREFS
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Sequence in context: A069068 A051412 A027468 this_sequence A112524 A153237 A011923
Adjacent sequences: A158923 A158924 A158925 this_sequence A158927 A158928 A158929
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KEYWORD
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sign,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Mar 31 2009
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 08 2009
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