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Search: id:A141577
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| A141577 |
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Alternating difference recursion: a(0) = -1; a(1) = 0; a(2) = 1; a(3) = -1; a(n)=a(n-1)-3*a(n-2)+3*a(n-3)-a(n-4). |
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+0
1
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| -1, 0, 1, -1, -3, 3, 8, -9, -21, 27, 55, -80, -143, 235, 369, -685, -944, 1983, 2391, -5705, -5985, 16320, 14769, -46441, -35803, 131507, 84824, -370665, -194813, 1040147, 427767, -2906448, -874495, 8088003, 1564377, -22416669, -1971296, 61883839, -1016657, -170165393, 20507391, 466069760
(list; graph; listen)
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OFFSET
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0,5
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REFERENCES
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Martin Gardner, Mathematical Circus,Randon House, New York, 1981, p. 165
http://math.fullerton.edu/mathews/software/Matlab2004.zip
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FORMULA
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O.g.f.: (-1+x-2x^2+x^3)/(1-x+3x^2-3x^3+x^4). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 25 2008
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CROSSREFS
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Sequence in context: A022663 A092481 A099508 this_sequence A123315 A052407 A105039
Adjacent sequences: A141574 A141575 A141576 this_sequence A141578 A141579 A141580
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KEYWORD
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sign
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AUTHOR
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Matt Wynne (mattwyn(AT)verizon.net), Aug 18 2008
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EXTENSIONS
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Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 25 2008
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