A054166 - OEIS

%I #7 Mar 30 2012 18:35:40

%S 0,0,1,1,3,5,10,17,32,56,106,195,365,691,1308,2495,4773,9174,17671,

%T 34144,66131,128330,249482,485761,947206,1849299,3614605,7072464,

%U 13851148,27150649,53262111,104562496,205412762,403786919,794202162

%N Number of positive integers <= 2^n of form 3 x^2 + 9 y^2.

%H <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a>

%K nonn

%O 0,5

%A _David W. Wilson_