Number of polyhexes with n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).

A075209

Number of polyhexes with n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =6a(4) =12a(5) =36a(6) =59a(7) =208a(8) =373a(9) =1024a(10) =1380a(11) =5966a(12) =6012a(13) =20061a(14) =32939a(15) =91715a(16) =99540a(17) =381899a(18) =390781a(19) =1486746a(20) =1856858

External references