Number of n X n 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1.

A203535

Number of n X n 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1.

Terms

    a(0) =0a(1) =4a(2) =72a(3) =3364a(4) =1700580a(5) =3743237124

External references