|
Search: id:A007239
|
|
|
| A007239 |
|
Energy function for hexagonal lattice.
(Formerly M2562)
|
|
+0
1
|
|
| 3, 6, 12, 24, 54, 138, 378, 1080, 3186, 9642, 29784, 93552, 297966, 960294, 3126408, 10268688, 33989388, 113277582, 379833906, 1280618784
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
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).
C. Domb, Ising model, in Phase Transitions and Critical Phenomena, vol. 3, ed. C. Domb and M. S. Green, Academic Press, 1974; p. 386.
|
|
LINKS
|
G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2
|
|
CROSSREFS
|
Sequence in context: A165929 A084717 A102254 this_sequence A088970 A068425 A136444
Adjacent sequences: A007236 A007237 A007238 this_sequence A007240 A007241 A007242
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Simon Plouffe (simon.plouffe(AT)gmail.com)
|
|
|
Search completed in 0.002 seconds
|
