Number of ways writing 2^n as unordered sums of 2 primes.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =2a(6) =5a(7) =3a(8) =8a(9) =11a(10) =22a(11) =25a(12) =53a(13) =76a(14) =151a(15) =244a(16) =435a(17) =749a(18) =1314a(19) =2367a(20) =4239a(21) =7471a(22) =13705a(23) =24928a(24) =45746a(25) =83467a(26) =153850a(27) =283746a(28) =525236a(29) =975685