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

A207748

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

Terms

    a(0) =9a(1) =81a(2) =289a(3) =900a(4) =3249a(5) =11449a(6) =42436a(7) =157609a(8) =597529a(9) =2280100a(10) =8791225a(11) =34093921a(12) =133033156a(13) =521345889a(14) =2051093521a(15) =8093881156a(16) =32021313025a(17) =126943276681a(18) =504097160004

External references