|
Search: id:A075213
|
|
|
| A075213 |
|
Number of polyhexes with n cells that tile the plane isohedrally but not by translation or by 180-degree rotation (Conway criterion). |
|
+0
11
|
|
| 0, 0, 0, 0, 1, 1, 33, 88, 611, 1803, 2985, 21250, 23564, 100221, 392655, 438188, 433150, 4762862, 2327445, 18839643, 46717154
(list; graph; listen)
|
|
|
OFFSET
|
1,7
|
|
|
COMMENT
|
A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally.
|
|
REFERENCES
|
Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.
|
|
LINKS
|
Joseph Myers, Polyhex tiling
|
|
CROSSREFS
|
Cf. A070766, A075207, A075208, A075209, A075210, A075211, A075212, A075214, A075215, A075204, A075222.
Sequence in context: A080700 A080200 A067705 this_sequence A114069 A098923 A098938
Adjacent sequences: A075210 A075211 A075212 this_sequence A075214 A075215 A075216
|
|
KEYWORD
|
hard,nonn
|
|
AUTHOR
|
Joseph Myers (jsm(AT)polyomino.org.uk), Sep 08 2002
|
|
EXTENSIONS
|
More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 08 2003
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007
|
|
|
Search completed in 0.002 seconds
|
