Number of fourth powers of primes <= 2^n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =1a(7) =2a(8) =2a(9) =2a(10) =3a(11) =3a(12) =4a(13) =4a(14) =5a(15) =6a(16) =6a(17) =8a(18) =8a(19) =9a(20) =11a(21) =12a(22) =14a(23) =16a(24) =18a(25) =21a(26) =24a(27) =28a(28) =31a(29) =36