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A197549 Number of free poly-IH10-tiles (holes allowed) with n cells. 5
1, 1, 5, 16, 62, 276, 1222, 5563, 25805, 120909, 572011, 2727485, 13089106, 63164265 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Equivalently, polyhexes where two polyhexes are considered equivalent if and only if they are related by a translation or a rotation of order 3.
REFERENCES
Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
LINKS
CROSSREFS
Sequence in context: A343164 A300317 A307469 * A365907 A034532 A092497
KEYWORD
hard,nonn
AUTHOR
Joseph Myers, Oct 16 2011
STATUS
approved

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Last modified March 28 11:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)