OFFSET
0,2
FORMULA
a(n) = C(n) + 2^n - 1.
EXAMPLE
a(3) = 12 = C(3) + 2^3 - 1 = 5 + 8 = 1.
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Aug 31 2007
STATUS
approved