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
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 07 2013
STATUS
approved