916033572652domain: NAppears in sequencesNumber of (n+2) X 3 binary arrays avoiding patterns 001 and 010 in rows and columns.at n=21A202609Number of 3Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 0 vertically.at n=23A207443