Number of positive integers <= 2^n of form 7 x^2 + 8 y^2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =3a(5) =5a(6) =9a(7) =17a(8) =30a(9) =57a(10) =105a(11) =199a(12) =373a(13) =701a(14) =1345a(15) =2575a(16) =4954a(17) =9562a(18) =18509a(19) =35916a(20) =69837a(21) =136010a(22) =265251a(23) =518118a(24) =1013282a(25) =1983707a(26) =3887580a(27) =7625434a(28) =14969119a(29) =29407328