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A275004
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a(n) = f_n(2), with f_0(x) = x+4, f_n+1(x) = (f_n)^x(x).
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5
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OFFSET
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0,1
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COMMENTS
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Next term is too large to include.
This function is a particular instance of the fast-iteration hierarchy function F[k]_n(x). Here we have f_n(x) = F[4]_n(x). See A275000 for details and definitions and formulae.
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LINKS
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MATHEMATICA
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f[0, x_] := x + 4; f[n_, x_] := Nest[f[n - 1, # ]&, x, x]; Table[f[n, 2], {n, 0, 3}]
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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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