Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about both main diagonals).

A037188

Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about both main diagonals).

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =0a(5) =2a(6) =0a(7) =0a(8) =0a(9) =1a(10) =0a(11) =2a(12) =1a(13) =3a(14) =1a(15) =1a(16) =0a(17) =2a(18) =0a(19) =2a(20) =0a(21) =1a(22) =1a(23) =2a(24) =2a(25) =0a(26) =0a(27) =0a(28) =1a(29) =1

External references