OFFSET
3,1
COMMENTS
The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2
S. Redner, Distribution functions in the interior of polymer chains, J. Phys. A 13 (1980), 3525-3541, doi:10.1088/0305-4470/13/11/023.
CROSSREFS
KEYWORD
nonn,walk
AUTHOR
EXTENSIONS
a(15)-a(20) from Sean A. Irvine, Nov 20 2017
STATUS
approved