45272931domain: NAppears in sequencesNumber of (n+1) X 2 0..2 arrays with equal numbers of 2 X 2 subblocks with sum over 4 and with sum under 4.at n=7A183740Number of (n+1) X 9 0..2 arrays with equal numbers of 2 X 2 subblocks with sum over 4 and with sum under 4.at n=0A183747