Number of ways to tile an n X 1 strip with 1 X 1 squares and 2 X 1 dominoes with the restriction that no three consecutive tiles are of the same type.

A137200

Number of ways to tile an n X 1 strip with 1 X 1 squares and 2 X 1 dominoes with the restriction that no three consecutive tiles are of the same type.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =5a(6) =7a(7) =9a(8) =13a(9) =18a(10) =25a(11) =34a(12) =47a(13) =65a(14) =90a(15) =124a(16) =171a(17) =236a(18) =326a(19) =450a(20) =621a(21) =857a(22) =1183a(23) =1633a(24) =2254a(25) =3111a(26) =4294a(27) =5927a(28) =8181a(29) =11292

External references