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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
OFFSET
1,2
COMMENTS
a(17) through a(32) are 2^65536,
a(33) through a(64) are 2^2^65536, etc.
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
Sequence in context: A087481 A038210 A244640 * A349452 A176739 A154919
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 07 2013
STATUS
approved