Number of n-bead two-color bracelets with 00 prohibited.

Terms

a(0) =2a(1) =2a(2) =3a(3) =3a(4) =5a(5) =5a(6) =8a(7) =9a(8) =14a(9) =16a(10) =26a(11) =31a(12) =49a(13) =64a(14) =99a(15) =133a(16) =209a(17) =291a(18) =455a(19) =657a(20) =1022a(21) =1510a(22) =2359a(23) =3545a(24) =5536a(25) =8442a(26) =13201a(27) =20319a(28) =31836a(29) =49353