Number of positive integers <= 2^n of form 5 x^2 + 10 y^2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =5a(6) =9a(7) =16a(8) =29a(9) =52a(10) =93a(11) =169a(12) =315a(13) =591a(14) =1119a(15) =2124a(16) =4052a(17) =7763a(18) =14922a(19) =28781a(20) =55629a(21) =107775a(22) =209241a(23) =406916a(24) =792579a(25) =1545812a(26) =3018687a(27) =5901609a(28) =11549484a(29) =22623452