Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.

A207427

Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.

Terms

    a(0) =6a(1) =36a(2) =114a(3) =361a(4) =1425a(5) =5625a(6) =20550a(7) =75076a(8) =282494a(9) =1062961a(10) =3953885a(11) =14707225a(12) =54963220a(13) =205406224a(14) =766145724a(15) =2857650849a(16) =10667504721a(17) =39821399809a(18) =148599935192a(19) =554524472896

External references