%I #11 Jan 24 2022 03:56:17
%S 0,0,1,2,4,7,12,23,41,77,142,270,504,958,1834,3505,6752,13016,25170,
%T 48775,94718,184210,358805,699919,1366853,2672452,5230345,10245791,
%U 20088113,39415538,77394348,152067981,298975703,588143637,1157617442
%N Number of positive integers <= 2^n of form 4 x^2 + 7 y^2.
%H <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a>
%Y Cf. A020683.
%K nonn
%O 0,4
%A _David W. Wilson_