Number of polyominoes with n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).
A075200
Number of polyominoes with n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =9a(5) =24a(6) =41a(7) =121a(8) =212a(9) =520a(10) =773a(11) =2577a(12) =3037a(13) =8081a(14) =13954a(15) =32124a(16) =41695a(17) =118784a(18) =150188a(19) =411484a(20) =604304a(21) =1305265a(22) =1954823a(23) =5326890a(24) =7331606
External references
- oeis: A075200