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A204321
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Start with 4. Square the previous term and subtract it.
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3
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = a(n-1)*(a(n-1)-1).
a(n) ~ c^(2^n), where c = 1.8401979467004699327247921093647566233474761412868967823409865843403604499... . - Vaclav Kotesovec, Dec 18 2014
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MAPLE
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if n = 1 then
4;
else
procname(n-1)*(procname(n-1)-1) ;
end if;
end proc:
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MATHEMATICA
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RecurrenceTable[{a[1]==4, a[n] == a[n-1]*(a[n-1]-1)}, a, {n, 1, 10}] (* Vaclav Kotesovec, Dec 18 2014 *)
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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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