55048995domain: NAppears in sequencesNumber of (n+1)X(4+1) 0..3 arrays with every 2X2 subblock summing to a nonzero multiple of 3.at n=3A251339T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to a nonzero multiple of 3.at n=24A251343