Number of polyominoes with n cells that tile the plane by translation or by 180-degree rotation (Conway criterion).
A075203
Number of polyominoes with n cells that tile the plane by translation or by 180-degree rotation (Conway criterion).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =35a(6) =101a(7) =320a(8) =961a(9) =2703a(10) =6174a(11) =19905a(12) =35060a(13) =94614a(14) =235381a(15) =467754a(16) =776873a(17) =2498766a(18) =3281990a(19) =9917824a(20) =18735749a(21) =33417839a(22) =52251279a(23) =181365462a(24) =239569893
External references
- oeis: A075203