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

A203830

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

Terms

    a(0) =1125a(1) =17289a(2) =270333a(3) =4238721a(4) =66490965a(5) =1043088057a(6) =16363800045a(7) =256713156657

External references