Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about one main diagonal).
A037186
Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about one main diagonal).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =0a(6) =1a(7) =5a(8) =3a(9) =3a(10) =6a(11) =3a(12) =9a(13) =5a(14) =13a(15) =14a(16) =12a(17) =14a(18) =16a(19) =17a(20) =13a(21) =18a(22) =34a(23) =43a(24) =55
External references
- oeis: A037186