229624domain: NAppears in sequencesT(n, 2*n-5), T given by A027960.at n=28A027967Number of (5+1)X(n+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.at n=19A253702