Number of square tiles in all tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

A127865

Number of square tiles in all tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

Terms

    a(0) =2a(1) =8a(2) =30a(3) =108a(4) =354a(5) =1152a(6) =3614a(7) =11204a(8) =34170a(9) =103176a(10) =308598a(11) =916236a(12) =2702834a(13) =7929872a(14) =23155182a(15) =67333140a(16) =195082218a(17) =563367960a(18) =1622185958a(19) =4658753564a(20) =13347741666a(21) =38160007200a(22) =108881256414a(23) =310108078116a(24) =881761288154

External references