Number of tilings of a 6 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.

A219970

Number of tilings of a 6 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =8a(4) =21a(5) =65a(6) =267a(7) =804a(8) =2530a(9) =9407a(10) =29876a(11) =96530a(12) =337607a(13) =1100968a(14) =3612017a(15) =12284181a(16) =40538721a(17) =133971666a(18) =450045654a(19) =1492504271a(20) =4949649998a(21) =16537407509a(22) =54951656907a(23) =182545459254a(24) =608458757050

External references