A230875 a(1)=0; thereafter a(n) = 2^a(ceiling(n/2)).

0, 1, 2, 2, 4, 4, 4, 4, 16, 16, 16, 16, 16, 16, 16, 16, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536

Offset

1,3

Comments

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

Links

Table of n, a(n) for n=1..32.

Formula

For n>2, a(n) = a tower of 2's of height ceiling(log_2(n))-1. E.g. a(17) = 2^2^2^2.

Crossrefs

Cf. A230863, A230874.

Sequence in context: A292597 A101656 A090557 * A035660 A302405 A115367

Adjacent sequences: A230872 A230873 A230874 * A230876 A230877 A230878

Keyword

nonn

Author

N. J. A. Sloane, Nov 07 2013

Status

approved