A054159 - OEIS

%I #11 Jan 24 2022 03:57:03

%S 0,1,1,2,4,8,15,27,51,93,174,329,620,1177,2250,4308,8286,15961,30871,

%T 59792,116083,225754,439666,857554,1674630,3273944,6407147,12550615,

%U 24605525,48277287,94790704,186242926,366153007,720274117,1417640576

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

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

%Y Cf. A020676.

%K nonn

%O 0,4

%A _David W. Wilson_