%I #7 Nov 21 2013 12:46:09
%S 1,2,4,7,13,25,47,90,169,321,610,1158,2197,4172,7922,15042,28561,
%T 54233,102979,195538,371293,705022,1338716,2541993,4826809,9165285,
%U 17403308,33045904,62748517,119148699,226242996
%N Powers of fourth root of 13 rounded up.
%t Ceiling[(Power[13, (4)^-1])^Range[0,40]] (* _Harvey P. Dale_, Aug 20 2011 *)
%K nonn
%O 0,2
%A _N. J. A. Sloane_.