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

A266043

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

Terms

    a(0) =2a(1) =8a(2) =30a(3) =146a(4) =620a(5) =3018a(6) =14356a(7) =72070a(8) =366704a(9) =1914616a(10) =10149476a(11) =54660630a(12) =297665832a(13) =1637684396a(14) =9080967528a(15) =50697416118a(16) =284611241532

External references