Number of polyominoes with n cells that tile the plane by translation but not by 180-degree rotation (Conway criterion).

A075199

Number of polyominoes with n cells that tile the plane by translation but not by 180-degree rotation (Conway criterion).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =1a(9) =2a(10) =10a(11) =135a(12) =142a(13) =591a(14) =2667a(15) =5291a(16) =6863a(17) =35876a(18) =34819a(19) =161812a(20) =272329a(21) =454465a(22) =651720a(23) =3441853a(24) =3442733

External references