64145domain: NAppears in sequencesa(n) = 1 + 2*n + 2^2*n*[n/2] + 2^3*n*[n/2]*[n/3] + 2^4*n*[n/2]*[n/3]*[n/4] + ... where [x]=floor(x).at n=8A208060Number of (w,x,y,z) with all terms in {1,...,n} and w*x>y*z+1.at n=19A212054