Number of inequivalent sublattices of index n in hexagonal lattice, where two sublattices are equivalent if they are related by a rotation or reflection preserving the hexagonal lattice.

A003051

Number of inequivalent sublattices of index n in hexagonal lattice, where two sublattices are equivalent if they are related by a rotation or reflection preserving the hexagonal lattice.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =2a(5) =3a(6) =3a(7) =5a(8) =4a(9) =4a(10) =3a(11) =8a(12) =4a(13) =5a(14) =6a(15) =9a(16) =4a(17) =8a(18) =5a(19) =10a(20) =8a(21) =7a(22) =5a(23) =15a(24) =7a(25) =8a(26) =9a(27) =13a(28) =6a(29) =14

External references