Number of (n+1) X 3 0..3 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

A203790

Number of (n+1) X 3 0..3 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

Terms

    a(0) =784a(1) =10576a(2) =142192a(3) =1911952a(4) =25708528a(5) =345682576a(6) =4648124656a(7) =62499715984a(8) =840385055728

External references