Number of positive integers <= 2^n of the form 3*x^2 + 4*y^2.

Terms

a(0) =0a(1) =0a(2) =2a(3) =3a(4) =5a(5) =9a(6) =16a(7) =29a(8) =53a(9) =98a(10) =181a(11) =341a(12) =640a(13) =1218a(14) =2321a(15) =4449a(16) =8546a(17) =16482a(18) =31845a(19) =61707a(20) =119760a(21) =232865a(22) =453511a(23) =884493a(24) =1727125a(25) =3376376a(26) =6607207a(27) =12941838a(28) =25371086a(29) =49776945