0,1

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

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

Partial sums of A005882.

Cf. A038588.

Adjacent sequences: A038584 A038585 A038586 this_sequence A038588 A038589 A038590

Sequence in context: A119104 A102253 A081513 this_sequence A090553 A078502 A107974

nonn

N. J. A. Sloane (njas(AT)research.att.com).