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0, 1, 1, 2, 5, 6, 21, 22, 85, 86, 341, 342, 1365, 1366, 5461, 5462, 21845, 21846, 87381, 87382, 349525, 349526, 1398101, 1398102, 5592405, 5592406, 22369621, 22369622, 89478485, 89478486, 357913941
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listen;
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OFFSET
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0,4
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LINKS
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FORMULA
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a(n) = 5*a(n-2) - 4*a(n-4).
From Lambert Herrgesell (zero815(AT)googlemail.com), Apr 19 2008: (Start)
a(n) = 1/6 - (1/2)*(-1)^n + (1/4)*2^n + (1/12)*(-2)^n;
g.f.: (-3*x^3 + x^2 + x)/(4*x^4 - 5*x^2 + 1). (End)
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PROG
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(Magma) [1/6 - (1/2)*(-1)^n + (1/4)*2^n + (1/12)*(-2)^n: n in [0..40]]; // Vincenzo Librandi, Aug 09 2011
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Apr 19 2008
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STATUS
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approved
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