OFFSET
1,2
FORMULA
a(n)=(2^(n-2)+2)*a(n-1), n>3. - Vladeta Jovovic, Nov 17 2003
EXAMPLE
a(4) = [{a(1)} + {a(2)} + {a(3)}] + [{a(1) + a(2)} + {a(1) + a(3)} + {a(2) + a(3)}] + [{a(1) + a(2) + a(3)}] = 36.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Amarnath Murthy, Nov 14 2003
EXTENSIONS
More terms from Ray Chandler, Nov 21 2003
STATUS
approved