Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any horizontal or antidiagonal neighbor equal to 3-1.

A265857

Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any horizontal or antidiagonal neighbor equal to 3-1.

Terms

    a(0) =6a(1) =10a(2) =30a(3) =42a(4) =154a(5) =478a(6) =2086a(7) =8094a(8) =33766a(9) =139874a(10) =595738a(11) =2519882a(12) =10738874a(13) =45886078a(14) =196936610a(15) =847655270a(16) =3659989354a(17) =15844521472a(18) =68767896826a(19) =299141921948

External references