Number of tilings using monominoes and L-trominoes in 2 X n chessboard, such that three monominoes cannot occur together in shape of L-tromino.

A227959

Number of tilings using monominoes and L-trominoes in 2 X n chessboard, such that three monominoes cannot occur together in shape of L-tromino.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =6a(4) =20a(5) =38a(6) =104a(7) =220a(8) =556a(9) =1244a(10) =3024a(11) =6944a(12) =16576a(13) =38536a(14) =91216a(15) =213280a(16) =502864a(17) =1178928a(18) =2774592a(19) =6512864a(20) =15315072a(21) =35969952a(22) =84550912a(23) =198634048a(24) =466825152a(25) =1096838208a(26) =2577550336a(27) =6056474880a(28) =14232064256a(29) =33441977216

External references