Number of subsets of {1,2,3,...,n}^2 with the property that every point has exactly two other closest points.

A378400

Number of subsets of {1,2,3,...,n}^2 with the property that every point has exactly two other closest points.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =8a(4) =52a(5) =676a(6) =14463

External references