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Search: id:A075115
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| 3, 2, 0, 2, 8, 12, 12, 16, 32, 56, 80, 112, 176, 288, 448, 672, 1024, 1600, 2496, 3840, 5888, 9088, 14080, 21760, 33536, 51712, 79872, 123392, 190464, 293888, 453632, 700416, 1081344, 1669120, 2576384, 3977216, 6139904, 9478144, 14630912
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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a(n) is nonnegative since the real root of x^3-2*x^2+2*x-2 is dominant. - Michael Somos Feb 28 2007
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LINKS
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N. J. A. Sloane, Transforms
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FORMULA
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a(n)=2a(n-1)-2a(n-2)+2a(n-3), a(0)=3, a(1)=2, a(2)=0. G.f.: (3 - 4*x + 2*x^2)/(1 - 2*x + 2*x^2 - 2*x^3)
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MATHEMATICA
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CoefficientList[Series[(3-4*x+2*x^2)/(1-2*x+2*x^2-2*x^3), {x, 0, 40}], x]
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PROGRAM
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(PARI) {a(n)= if(n<0, 0, polsym( x^3 -2*x^2 +2*x -2, n) [n+1])} /* Michael Somos Feb 28 2007 */
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CROSSREFS
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Cf. A073145, A073498.
Sequence in context: A129576 A077814 A131728 this_sequence A085080 A079714 A114907
Adjacent sequences: A075112 A075113 A075114 this_sequence A075116 A075117 A075118
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KEYWORD
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easy,nonn
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Sep 02 2002
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