Number of ways to place 3 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.
A243212
Number of ways to place 3 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) =15a(2) =107a(3) =428a(4) =1282a(5) =3198a(6) =7022a(7) =14020a(8) =26000a(9) =45445a(10) =75665a(11) =120960a(12) =186802a(13) =280028a(14) =409052a(15) =584088a(16) =817392a(17) =1123515a(18) =1519575a(19) =2025540a(20) =2664530a(21) =3463130a(22) =4451722a(23) =5664828a(24) =7141472a(25) =8925553a(26) =11066237a(27) =13618360a(28) =16642850a(29) =20207160
External references
- oeis: A243212