270125

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, three or four distinct values for every i<=n and j<=n.at n=7A211464
• Coordination sequence for (2,6,infinity) tiling of hyperbolic plane.at n=26A265070