Number of binary strings of length n with no substrings equal to 0011 0101 or 1100.

Terms

a(0) =13a(1) =20a(2) =31a(3) =48a(4) =74a(5) =114a(6) =175a(7) =268a(8) =410a(9) =626a(10) =954a(11) =1452a(12) =2207a(13) =3350a(14) =5079a(15) =7692a(16) =11637a(17) =17588a(18) =26558a(19) =40068a(20) =60401a(21) =90982a(22) =136946a(23) =205988a(24) =309634a(25) =465140a(26) =698329a(27) =1047828a(28) =1571393a(29) =2355348