799821

Appears in sequences

• Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, two or three distinct values for every i<=n and j<=n.at n=12A211462
• Number of (w,x,y,z) with all terms in {1,...,n} and w*x<=2*y*z.at n=33A211787