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

A203279

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

Terms

    a(0) =0a(1) =4a(2) =28a(3) =676a(4) =72852a(5) =26193924a(6) =31747280900

External references