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A282180
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a(n+1) = a(n)*(a(n)^2 - 3) with a(0) = 8.
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1
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = (4 + sqrt(15))^(3^n) + (4 - sqrt(15))^(3^n). - Bruno Berselli, Feb 10 2017
a(n) = -2*cos(3^n * arccos(-4)). - Daniel Suteu, Feb 10 2017
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MATHEMATICA
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RecurrenceTable[{a[0] == 8, a[n] == a[n-1]^3 - 3 a[n-1]}, a, {n, 8}]
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PROG
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(Magma) [n eq 1 select 8 else Self(n-1)^3 - 3*Self(n-1): n in [1..6]];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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