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A081651 a(n) = floor((3/2)^^n), where x^^n is the power tower x^(x^(...^x)) with n x's. 2
1, 1, 1, 2, 2, 2, 2, 3, 3, 4, 5, 10, 86, 1499263005586576 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

f[n_] := (3/2)^n; Floor[ NestList[f, 3/2, 12]]

CROSSREFS

Cf. A014221.

Sequence in context: A275882 A005139 A005134 * A269333 A029193 A005858

Adjacent sequences:  A081648 A081649 A081650 * A081652 A081653 A081654

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Mar 26 2003

EXTENSIONS

New definition from Benoit Jubin, Jul 22 2008

Inserted a missing 1 at the beginning, Benoit Jubin, Aug 04 2008

STATUS

approved

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Last modified November 22 05:52 EST 2018. Contains 317453 sequences. (Running on oeis4.)