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

A207662

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

Terms

    a(0) =9a(1) =81a(2) =198a(3) =870a(4) =3358a(5) =12040a(6) =47320a(7) =182192a(8) =676396a(9) =2611234a(10) =9988846a(11) =37623896a(12) =144190134a(13) =550120868a(14) =2085006194a(15) =7964169488a(16) =30353664882a(17) =115358871282a(18) =439963965434

External references