Number of (n+1)X(n+1) 0..3 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum.

A187403

Number of (n+1)X(n+1) 0..3 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum.

Terms

    a(0) =16a(1) =580a(2) =59008a(3) =18555136a(4) =19210448896

External references