1,2

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

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

G. A. Baker et al., On the two-dimensional, spin-1/2 Heisenberg ferromagnetic models, Phys. Lett., 25A (1967), 207-209.

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

Index entries for sequences related to specific heat

Sequence in context: A002169 A050685 A133361 this_sequence A071587 A134115 A061750

Adjacent sequences: A005397 A005398 A005399 this_sequence A005401 A005402 A005403

sign

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

Better description from S. R. Finch (Steven.Finch(AT)inria.fr)