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A088679
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a(n) = a(n-1)^2 * n / (n-1), n>1, a(0) = 0, a(1) = 1.
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3
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OFFSET
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0,3
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COMMENTS
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Unreduced numerators of: f(1) = 1, f(n) = f(n-1) + f(n-1)/(n-1). - Daniel Suteu, Jul 29 2016
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LINKS
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FORMULA
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a(n) is asymptotic to c^(2^n)*(1-1/n+2/n^2-6/n^3+25/n^4-137/n^5+...) where c=1.28906475773... and coefficient of n^-k is (-1)^k*A084784(k).
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EXAMPLE
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x + 2*x^2 + 6*x^3 + 48*x^4 + 2880*x^5 + 9953280*x^6 + ...
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MATHEMATICA
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Join[{0}, RecurrenceTable[{a[1]==1, a[n]==a[n-1]^2 n/(n-1)}, a, {n, 10}]] (* Harvey P. Dale, Jan 16 2015 *)
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PROG
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(PARI) {a(n) = if( n<2, n>0, a(n-1)^2 * n / (n-1))}
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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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