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

0,2

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

Table of n, a(n) for n=0..50.

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

Crossrefs

Union of A038588 and A038590.

Sequence in context: A072757 A295897 A032849 * A333794 A349214 A182181

Adjacent sequences: A038588 A038589 A038590 * A038592 A038593 A038594

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved