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

A207244

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

Terms

    a(0) =9a(1) =81a(2) =287a(3) =987a(4) =2884a(5) =7165a(6) =17929a(7) =40646a(8) =90602a(9) =196548a(10) =412733a(11) =859077a(12) =1751887a(13) =3532169a(14) =7052859a(15) =13932019a(16) =27335037a(17) =53236611a(18) =103050502a(19) =198448577a(20) =380245761a(21) =725544748a(22) =1379004108a(23) =2611731954a(24) =4930796893a(25) =9281596371

External references