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A075210
Number of polyhexes with n cells that tile the plane by 180-degree rotation (Conway criterion) but not by translation.
10
0, 0, 0, 1, 9, 39, 197, 721, 2717, 8211, 19836, 74497, 132611, 403534, 1127416, 2364402, 4173316, 15604400, 21318428, 73965916, 154211880
OFFSET
1,5
REFERENCES
Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.
KEYWORD
hard,nonn
AUTHOR
Joseph Myers, Sep 08 2002
EXTENSIONS
More terms from Joseph Myers, Nov 08 2003
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007
STATUS
approved