Number of ways writing 2^n as a sum of a prime and a nonprime.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =2a(5) =7a(6) =8a(7) =25a(8) =38a(9) =75a(10) =128a(11) =259a(12) =458a(13) =876a(14) =1598a(15) =3024a(16) =5672a(17) =10753a(18) =20372a(19) =38656a(20) =73547a(21) =140669a(22) =268537a(23) =514307a(24) =986379a(25) =1896755a(26) =3650109a(27) =7036061a(28) =13580371a(29) =26241380