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A197160
Number of fixed poly-[3^4.6]-tiles (holes allowed) with n cells.
1
6, 15, 44, 141, 480, 1703, 6216, 23136, 87334, 333309, 1283706, 4982458, 19466130, 76479612, 301923554
OFFSET
1,1
REFERENCES
Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4.
CROSSREFS
Cf. A197159.
Sequence in context: A272320 A137806 A193449 * A182420 A117961 A327769
KEYWORD
hard,nonn
AUTHOR
Joseph Myers, Oct 10 2011
STATUS
approved