OFFSET
1,1
FORMULA
a(1)=2, a(n+1)=2^a(n)-3^(n-1)
EXAMPLE
a(1)=2, a(2)=2^a(1)-3^0=2^2-3^0=3
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Parviz Afereidoon (afereidoon(AT)gmail.com), Apr 13 2006
STATUS
approved