181499

Properties

Appears in sequences

• Number of permutations p of 1,2,...,n satisfying p(i+2) - p(i) <> 2 for all 1 <= i <= n-2.at n=9A189281
• Coordination sequence for (2,4,8) tiling of hyperbolic plane.at n=31A265063
• Prime numbersat n=16450