Number of polyhexes with n cells that tile the plane by translation or by 180-degree rotation (Conway criterion).
A075212
Number of polyhexes with n cells that tile the plane by translation or by 180-degree rotation (Conway criterion).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =75a(6) =257a(7) =930a(8) =3104a(9) =9265a(10) =21304a(11) =81392a(12) =139612a(13) =427454a(14) =1176912a(15) =2491134a(16) =4319362a(17) =16243200a(18) =21965930a(19) =76738851a(20) =158374741
External references
- oeis: A075212