Number of inequivalent (mod D_3) ways to place 5 points on a triangular grid of side n so that they are not vertices of an equilateral triangle of any orientation.
A243144
Number of inequivalent (mod D_3) ways to place 5 points on a triangular grid of side n so that they are not vertices of an equilateral triangle of any orientation.
Terms
- a(0) =0a(1) =7a(2) =204a(3) =1891a(4) =10846a(5) =46068a(6) =159830a(7) =477033a(8) =1268614a(9) =3075291a(10) =6911894a(11) =14580293a(12) =29145928a(13) =55620816a(14) =101945063a(15) =180327134a(16) =309087474
External references
- oeis: A243144