Number of ways to place 5 points on a triangular grid of side n so that no three of these points are vertices of an equilateral triangle of any orientation.

A240442

Number of ways to place 5 points on a triangular grid of side n so that no three of these points are vertices of an equilateral triangle of any orientation.

Terms

    a(0) =0a(1) =39a(2) =1194a(3) =11259a(4) =64776a(5) =275805a(6) =957516a(7) =2859768a(8) =7606821a(9) =18444537a(10) =41458599a(11) =87464157a(12) =174846963a(13) =333687378a(14) =611613150a(15) =1081890447

External references