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A075215 Number of anisohedral polyhexes with n cells. 10
0, 0, 0, 0, 0, 1, 4, 36, 73, 258, 501, 999, 1383, 4835, 4685, 10576, 8497, 42156, 12931, 129325, 84555 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

COMMENTS

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 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, A075208, A075209, A075210, A075211, A075212, A075213, A075214, A075206, A075224.

Sequence in context: A053939 A167632 A072157 * A193833 A193183 A152760

Adjacent sequences:  A075212 A075213 A075214 * A075216 A075217 A075218

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 December 6 04:14 EST 2019. Contains 329784 sequences. (Running on oeis4.)