Number of sexy consecutive prime pairs below 2^n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =4a(6) =7a(7) =13a(8) =25a(9) =45a(10) =80a(11) =136a(12) =251a(13) =443a(14) =784a(15) =1377a(16) =2420a(17) =4312a(18) =7756a(19) =14106a(20) =25554a(21) =46776a(22) =85774a(23) =157325a(24) =290773a(25) =538520a(26) =1000321a(27) =1861364a(28) =3473165a(29) =6493997