Number of (n+2) X (n+2) 0..1 arrays x(i,j) with Sum_{j=1..n+2} j*x(i,j) equal for every row, Sum{i=1..n+2} i*x(i,j) equal for every column, and upper left element zero.

A232647

Number of (n+2) X (n+2) 0..1 arrays x(i,j) with Sum_{j=1..n+2} j*x(i,j) equal for every row, Sum{i=1..n+2} i*x(i,j) equal for every column, and upper left element zero.