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A213951
Number of free poly-IH16-tiles (holes allowed) with n cells
1
1, 2, 8, 24, 98, 418, 1846, 8378, 38776, 181482, 858387, 4091814, 19635210, 94749398
OFFSET
1,2
REFERENCES
Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
CROSSREFS
Cf. A212416.
Sequence in context: A357160 A362139 A060899 * A150665 A150666 A150667
KEYWORD
hard,more,nonn
AUTHOR
Joseph Myers, Jun 26 2012
STATUS
approved