Triangle T(n, k) = Numbers of inequivalent (mod D_3) ways to place k points on a triangular grid of side n so that no three of them are vertices of an equilateral triangle of any orientation. Triangle read by rows.
A243141
Triangle T(n, k) = Numbers of inequivalent (mod D_3) ways to place k points on a triangular grid of side n so that no three of them are vertices of an equilateral triangle of any orientation. Triangle read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =3a(6) =1a(7) =3a(8) =10a(9) =19a(10) =22a(11) =7a(12) =1a(13) =4a(14) =22a(15) =75a(16) =170a(17) =204a(18) =115a(19) =18a(20) =1a(21) =5a(22) =41a(23) =218a(24) =816a(25) =1891a(26) =2635a(27) =1909a(28) =628a(29) =58
External references
- oeis: A243141