Number of positive integers <= 2^n of form 3 x^2 + 5 y^2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =4a(5) =9a(6) =14a(7) =28a(8) =51a(9) =92a(10) =173a(11) =319a(12) =603a(13) =1148a(14) =2188a(15) =4191a(16) =8051a(17) =15535a(18) =30003a(19) =58138a(20) =112855a(21) =219452a(22) =427408a(23) =833549a(24) =1627633a(25) =3181948a(26) =6226802a(27) =12196599a(28) =23910445a(29) =46911094