Number of squared primes <= 2^n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =4a(7) =5a(8) =6a(9) =8a(10) =11a(11) =14a(12) =18a(13) =24a(14) =31a(15) =42a(16) =54a(17) =72a(18) =97a(19) =128a(20) =172a(21) =229a(22) =309a(23) =418a(24) =564a(25) =760a(26) =1028a(27) =1393a(28) =1900a(29) =2585