Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 1 0 1 vertically.

A208035

Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 1 0 1 vertically.

Terms

    a(0) =9a(1) =81a(2) =289a(3) =961a(4) =3249a(5) =11025a(6) =37249a(7) =126025a(8) =426409a(9) =1442401a(10) =4879681a(11) =16507969a(12) =55845729a(13) =188925025a(14) =639128961a(15) =2162157001a(16) =7314525625a(17) =24744863025a(18) =83711270241a(19) =283193201281a(20) =958035736849

External references