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A275003 a(n) = f_n(2), with f_0(x) = x+3, f_n+1(x) = (f_n)^x(x). 5
5, 8, 32, 590295810358705651712 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

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[3]_n(x). See A275000 for details and definitions and formulae.

LINKS

Table of n, a(n) for n=0..3.

MATHEMATICA

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

CROSSREFS

A154714(F[1]_n(2)), A275002(F[n]_3(2)), A275004(F[4]_n(x)), A275005(F[5]_n(x)), A275006(F[6]_n(x)), A275009(F[k]_n(2)).

Sequence in context: A068981 A099631 A199396 * A032790 A187997 A188065

Adjacent sequences:  A275000 A275001 A275002 * A275004 A275005 A275006

KEYWORD

nonn

AUTHOR

Natan Arie' Consigli, Nov 09 2016

STATUS

approved

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Last modified October 19 00:36 EDT 2018. Contains 316327 sequences. (Running on oeis4.)