55551652domain: NAppears in sequencesNumber of (n+1) X (1+1) 0..3 arrays with every 2 X 2 subblock summing to 5 6 or 7.at n=6A251374Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7.at n=0A251380T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7.at n=21A251381