132534domain: NAppears in sequencesNumber of (w,x,y,z) with all terms in {1,...,n} and w*x<=2*y*z.at n=21A211787Number of nX3 0..1 arrays with every element unequal to 0, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=19A318086