6424279907domain: NAppears in sequencesNumber of (n+1) X (n+1) 0..1 arrays with no 2 X 2 subblock having zero or two 1's.at n=6A251211Number of (n+1)X(7+1) 0..1 arrays with no 2X2 subblock having zero or two 1s.at n=6A251218