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A075208 Number of polyhexes with n cells that tile the plane by translation but not by 180-degree rotation (Conway criterion). 10
0, 0, 0, 0, 0, 0, 1, 1, 14, 30, 88, 929, 989, 3859, 16557, 35017, 46506, 256901, 256721, 1286189, 2306003 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

REFERENCES

Branko Gr├╝nbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

LINKS

Table of n, a(n) for n=1..21.

Joseph Myers, Polyhex tiling

CROSSREFS

Cf. A070766, A075207, A075209, A075210, A075211, A075212, A075213, A075214, A075215, A075199, A075217.

Sequence in context: A104776 A308312 A101960 * A228124 A293391 A015222

Adjacent sequences:  A075205 A075206 A075207 * A075209 A075210 A075211

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

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Last modified November 14 01:24 EST 2019. Contains 329108 sequences. (Running on oeis4.)