%I #14 Jan 24 2022 03:56:14
%S 1,1,2,4,7,13,22,40,73,132,245,458,864,1638,3123,5979,11484,22140,
%T 42773,82865,160809,312659,608857,1187323,2318344,4531879,8867913,
%U 17369053,34048772,66799240,131146379,257651913,506503984,996288321
%N Number of positive integers <= 2^n of the form x^2 + 5*y^2.
%H <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a>
%Y Cf. A020669.
%K nonn
%O 0,3
%A _David W. Wilson_