Number of subsets of {1, ..., n} containing exactly one twin prime pair.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =8a(5) =16a(6) =32a(7) =64a(8) =128a(9) =256a(10) =512a(11) =1024a(12) =768a(13) =1536a(14) =3072a(15) =6144a(16) =12288a(17) =24576a(18) =16384a(19) =32768a(20) =65536a(21) =131072a(22) =262144a(23) =524288a(24) =1048576a(25) =2097152a(26) =4194304a(27) =8388608a(28) =16777216a(29) =33554432