Number of tilings of a 2 X 2 X n box using bricks of shape 3 X 1 X 1 and 2 X 1 X 1.

A233505

Number of tilings of a 2 X 2 X n box using bricks of shape 3 X 1 X 1 and 2 X 1 X 1.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =45a(4) =201a(5) =1062a(6) =5564a(7) =28859a(8) =152012a(9) =799387a(10) =4202165a(11) =22117465a(12) =116385352a(13) =612443308a(14) =3223118545a(15) =16961953022a(16) =89264218645a(17) =469766599585

External references