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A212086
Number of free poly-IH5-tiles (holes allowed) with n cells
0
1, 4, 11, 48, 186, 831, 3652, 16766, 77359, 363029, 1716033, 8183910, 39267086, 189500947
OFFSET
1,2
COMMENTS
Also counts free poly-IH6-tiles.
REFERENCES
Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
CROSSREFS
Sequence in context: A372115 A149310 A149311 * A361359 A296532 A149312
KEYWORD
hard,more,nonn
AUTHOR
Joseph Myers, Jun 26 2012
STATUS
approved