37945600domain: NAppears in sequencesNumber of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having zero permanent.at n=8A206248Number of n X 6 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=19A208140