Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 0 1 vertically.

A207271

Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 0 1 vertically.

Terms

    a(0) =9a(1) =81a(2) =193a(3) =611a(4) =1602a(5) =3513a(6) =8327a(7) =17568a(8) =36988a(9) =76723a(10) =153865a(11) =308777a(12) =608391a(13) =1189918a(14) =2313136a(15) =4458599a(16) =8562580a(17) =16354499a(18) =31118601a(19) =59018399a(20) =111556847a(21) =210352934a(22) =395641010a(23) =742567333a(24) =1391072247a(25) =2601239676a(26) =4856734666

External references