Number of polyominoes with n cells whose symmetry group (excluding reflections) has order at least 2.

A144554

Number of polyominoes with n cells whose symmetry group (excluding reflections) has order at least 2.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =7a(6) =8a(7) =25a(8) =25a(9) =82a(10) =85a(11) =302a(12) =307a(13) =1111a(14) =1131a(15) =4216a(16) =4267a(17) =16076a(18) =16253a(19) =61976a(20) =62475a(21) =239927a(22) =241447a(23) =933576a(24) =937574a(25) =3644073a(26) =3653624a(27) =14267757a(28) =14281711a(29) =55996279

External references