1/25 the number of (n+1)X7 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

A203654

1/25 the number of (n+1)X7 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Terms

    a(0) =531441a(1) =178019197a(2) =71156938905

External references