11062276domain: NAppears in sequencesNumber of n X 3 binary arrays with every element neighboring horizontally or vertically both a 0 and a 1.at n=11A203280Number of 2 X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=23A207025