Number of positive integers <= 2^n of form 6*x^2 + 7*y^2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =3a(5) =6a(6) =11a(7) =20a(8) =36a(9) =69a(10) =126a(11) =237a(12) =446a(13) =841a(14) =1595a(15) =3046a(16) =5840a(17) =11238a(18) =21684a(19) =41955a(20) =81333a(21) =158007a(22) =307378a(23) =598968a(24) =1168767a(25) =2283307a(26) =4465653a(27) =8742429a(28) =17130723a(29) =33594988