104470domain: NAppears in sequencesNumber of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=9A207027Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<3z.at n=20A212512