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

A207731

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

Terms

    a(0) =9a(1) =81a(2) =189a(3) =441a(4) =2163a(5) =10609a(6) =33063a(7) =103041a(8) =418263a(9) =1697809a(10) =5875227a(11) =20331081a(12) =77333859a(13) =294156801a(14) =1057136187a(15) =3799119769a(16) =14123193995a(17) =52502848225a(18) =191262879795a(19) =696752470089

External references