48714917964domain: NAppears in sequencesNumber of (n+1)X4 0..3 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum.at n=4A185570T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum.at n=23A185571