Number of (n+1) X 4 0..7 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

A203730

Number of (n+1) X 4 0..7 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

Terms

    a(0) =216000a(1) =19071424a(2) =1754118528a(3) =161916229056

External references