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

A207124

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

Terms

    a(0) =9a(1) =81a(2) =289a(3) =1024a(4) =4096a(5) =14161a(6) =45796a(7) =150544a(8) =481636a(9) =1493284a(10) =4601025a(11) =14055001a(12) =42380100a(13) =126900225a(14) =378108025a(15) =1119906225a(16) =3301766521a(17) =9702250000a(18) =28419216400a(19) =83012558161a(20) =241951836996a(21) =703860593296

External references