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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =10a(6) =18a(7) =32a(8) =59a(9) =107a(10) =202a(11) =375a(12) =709a(13) =1344a(14) =2567a(15) =4905a(16) =9423a(17) =18151a(18) =35051a(19) =67879a(20) =131688a(21) =255972a(22) =498339a(23) =971558a(24) =1896661a(25) =3706983a(26) =7252576a(27) =14203258a(28) =27839240a(29) =54610355