Number of nX4 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 0 vertically.

A208160

Number of nX4 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 0 vertically.

Terms

    a(0) =9a(1) =81a(2) =281a(3) =981a(4) =3893a(5) =13825a(6) =46611a(7) =159545a(8) =538479a(9) =1783379a(10) =5887303a(11) =19371713a(12) =63378811a(13) =206749703a(14) =673357733a(15) =2188957835a(16) =7106004543a(17) =23048741587a(18) =74706706363a(19) =242002483927a(20) =783622093421

External references