Number of tilings of an n X 1 rectangle by tiles of dimension 1 X 1 and 2 X 1 such that every tile is next to a tile of different size.

A245596

Number of tilings of an n X 1 rectangle by tiles of dimension 1 X 1 and 2 X 1 such that every tile is next to a tile of different size.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =2a(4) =1a(5) =1a(6) =4a(7) =3a(8) =4a(9) =8a(10) =9a(11) =12a(12) =19a(13) =24a(14) =33a(15) =48a(16) =64a(17) =88a(18) =124a(19) =169a(20) =233a(21) =324a(22) =445a(23) =614a(24) =850a(25) =1171a(26) =1616a(27) =2233a(28) =3080a(29) =4251

External references