A038591 Sizes of clusters in hexagonal lattice A_2 with 3-fold symmetry.

1, 3, 6, 7, 12, 13, 18, 19, 21, 27, 30, 31, 36, 37, 42, 43, 48, 54, 55, 61, 63, 69, 73, 75, 78, 84, 85, 90, 91, 96, 97, 102, 109, 114, 120, 121, 123, 127, 129, 135, 139, 141, 144, 150, 151, 156, 163, 168, 169, 174, 180

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Comments

The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.

Links

• G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2

Crossrefs

Union of A038588 and A038590.