Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with 180 deg rotational symmetry).
A037187
Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with 180 deg rotational symmetry).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =2a(6) =10a(7) =7a(8) =7a(9) =13a(10) =30a(11) =33a(12) =82a(13) =61a(14) =283a(15) =189a(16) =282a(17) =328a(18) =594a(19) =675a(20) =2413a(21) =1248a(22) =3968a(23) =2852a(24) =8983
External references
- oeis: A037187