OFFSET
1,2
FORMULA
(13^n + 13^m) / 2, n = 0, 1, 2, 3 ..., m = 0, 1, 2, 3, ... n.
EXAMPLE
a(4) = 85 = (11^2+11^0) / 2
MATHEMATICA
Union[Total/@Tuples[13^Range[0, 9], 2]]/2 (* Harvey P. Dale, Sep 15 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jeremy Gardiner, Jul 21 2002
STATUS
approved