

A275004


a(n) = f_n(2), with f_0(x) = x+4, f_n+1(x) = (f_n)^x(x).


5




OFFSET

0,1


COMMENTS

Next term is too large to include.
This function is a particular instance of the fastiteration hierarchy function F[k]_n(x). Here we have f_n(x) = F[4]_n(x). See A275000 for details and definitions and formulae.


LINKS



MATHEMATICA

f[0, x_] := x + 4; f[n_, x_] := Nest[f[n  1, # ]&, x, x]; Table[f[n, 2], {n, 0, 3}]


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



