687109914883domain: 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=6A251339Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock summing to a nonzero multiple of 3.at n=3A251342