A230874 - OEIS

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A230874

a(1)=1; thereafter a(n) = 2^a(ceiling(n/2)).

2

1, 2, 4, 4, 16, 16, 16, 16, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536

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OFFSET

1,2

COMMENTS

a(17) through a(32) are 2^65536,

a(33) through a(64) are 2^2^65536, etc.

LINKS

Table of n, a(n) for n=1..16.

FORMULA

For n>1, a(n) = a tower of 2's of height ceiling(log_2(n)). E.g. a(15) = 2^2^2^2.

CROSSREFS

Cf. A230863, A230875.

Sequence in context: A087481 A038210 A244640 * A349452 A176739 A154919

Adjacent sequences: A230871 A230872 A230873 * A230875 A230876 A230877

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 07 2013

STATUS

approved