Number of ways to place 5 points on a triangular grid of side n, so that no three of them are vertices of an equilateral triangle with sides parallel to the grid.
A243214
Number of ways to place 5 points on a triangular grid of side n, so that no three of them are vertices of an equilateral triangle with sides parallel to the grid.
Terms
- a(0) =0a(1) =63a(2) =1566a(3) =13971a(4) =77124a(5) =319206a(6) =1083723a(7) =3181401a(8) =8344854a(9) =20006349a(10) =44548227a(11) =93248628a(12) =185176866a(13) =351410664a(14) =640972980a(15) =1129067352a(16) =1928196432a(17) =3203016813
External references
- oeis: A243214